All Publications

Nano-Optics and Biophotonics

All publications

Tunable nano-plasmonic photodetectors. Pertsch, Patrick; Kullock, René; Gabriel, Vinzenz; Zurak, Luka; Emmerling, Monika; Hecht, Bert in arxiv (2022). 2204(13978)

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Atomically Smooth Single-Crystalline Platform for Low-Loss Plasmonic Nanocavities. Liu, Lufang; Krasavin, Alexey V.; Zheng, Junsheng; Tong, Yuanbiao; Wang, Pan; Wu, Xiaofei; Hecht, Bert; Pan, Chenxinyu; Li, Jialin; Li, Linjun; Guo, Xin; Zayats, Anatoly V.; Tong, Limin in Nano Letters (2022).

[ Abstract ] [ BibTeX ] [ EndNote ]

Light-driven microdrones. Wu, Xiaofei; Ehehalt, Raphael; Razinskas, Gary; Feichtner, Thorsten; Qin, Jin; Hecht, Bert in Nature Nanotechnology (2022).

Shared Link

further coverage:
Nature Research Highlight, Nature Community blog post

[ Abstract ] [ BibTeX ] [ EndNote ] [ URL ] [ DOI ]

@article{wu2022lightdriven,
  abstract = {When photons interact with matter, forces and torques occur due to the transfer of linear and angular momentum, respectively. The resulting accelerations are small for macroscopic objects but become substantial for microscopic objects with small masses and moments of inertia, rendering photon recoil very attractive to propel micro- and nano-objects. However, until now, using light to control object motion in two or three dimensions in all three or six degrees of freedom has remained an unsolved challenge. Here we demonstrate light-driven microdrones (size roughly 2 μm and mass roughly 2 pg) in an aqueous environment that can be manoeuvred in two dimensions in all three independent degrees of freedom (two translational and one rotational) using two overlapping unfocused light fields of 830 and 980 nm wavelength. To actuate the microdrones independent of their orientation, we use up to four individually addressable chiral plasmonic nanoantennas acting as nanomotors that resonantly scatter the circular polarization components of the driving light into well-defined directions. The microdrones are manoeuvred by only adjusting the optical power for each motor (the power of each circular polarization component of each wavelength). The actuation concept is therefore similar to that of macroscopic multirotor drones. As a result, we demonstrate manual steering of the microdrones along complex paths. Since all degrees of freedom can be addressed independently and directly, feedback control loops may be used to counteract Brownian motion. We posit that the microdrones can find applications in transport and release of cargos, nanomanipulation, and local probing and sensing of nano and mesoscale objects.},
  author = {Wu, Xiaofei and Ehehalt, Raphael and Razinskas, Gary and Feichtner, Thorsten and Qin, Jin and Hecht, Bert},
  journal = {Nature Nanotechnology},
  keywords = {driven experiment light microdrones nano-optics near-field plasmon},
  month = {April},
  note = {<i style="font-style: normal;"><a href="https://rdcu.be/cLP6O">Shared Link</a><br><br><b>further coverage:</b><br> <a href="https://www.nature.com/articles/d41586-022-01132-0">Nature Research Highlight</a>, <a href="https://engineeringcommunity.nature.com/posts/light-driven-microdrones-a-new-level-of-optical-manipulation">Nature Community blog post</a></i>},
  title = {Light-driven microdrones},
  year = 2022
}

%0 Journal Article
%1 wu2022lightdriven
%A Wu, Xiaofei
%A Ehehalt, Raphael
%A Razinskas, Gary
%A Feichtner, Thorsten
%A Qin, Jin
%A Hecht, Bert
%D 2022
%J Nature Nanotechnology
%R https://doi.org/10.1038/s41565-022-01099-z
%T Light-driven microdrones
%U https://www.nature.com/articles/s41565-022-01099-z
%X When photons interact with matter, forces and torques occur due to the transfer of linear and angular momentum, respectively. The resulting accelerations are small for macroscopic objects but become substantial for microscopic objects with small masses and moments of inertia, rendering photon recoil very attractive to propel micro- and nano-objects. However, until now, using light to control object motion in two or three dimensions in all three or six degrees of freedom has remained an unsolved challenge. Here we demonstrate light-driven microdrones (size roughly 2 μm and mass roughly 2 pg) in an aqueous environment that can be manoeuvred in two dimensions in all three independent degrees of freedom (two translational and one rotational) using two overlapping unfocused light fields of 830 and 980 nm wavelength. To actuate the microdrones independent of their orientation, we use up to four individually addressable chiral plasmonic nanoantennas acting as nanomotors that resonantly scatter the circular polarization components of the driving light into well-defined directions. The microdrones are manoeuvred by only adjusting the optical power for each motor (the power of each circular polarization component of each wavelength). The actuation concept is therefore similar to that of macroscopic multirotor drones. As a result, we demonstrate manual steering of the microdrones along complex paths. Since all degrees of freedom can be addressed independently and directly, feedback control loops may be used to counteract Brownian motion. We posit that the microdrones can find applications in transport and release of cargos, nanomanipulation, and local probing and sensing of nano and mesoscale objects.

Color-Switchable Subwavelength Organic Light-Emitting Antennas. Grimm, Philipp; Zeißner, Stefan; Rödel, Maximilian; Wiegand, Simon; Hammer, Sebastian; Emmerling, Monika; Schatz, Enno; Kullock, René; Pflaum, Jens; Hecht, Bert in Nano Lett. (2022).

[ Abstract ] [ BibTeX ] [ EndNote ] [ URL ] [ DOI ]

Single quantum emitter Dicke enhancement. Tufarelli, Tommaso; Friedrich, Daniel; Groß, Heiko; Hamm, Joachim; Hess, Ortwin; Hecht, Bert in Phys. Rev. Research (2021).

» arXiv: 2010.12585v2 (2021).

[ Abstract ] [ BibTeX ] [ EndNote ] [ URL ] [ DOI ]

@article{tufarelli2020dicke,
  abstract = {Coupling N identical emitters to the same field mode is a well-established method to enhance light-matter interaction. However, the resulting √N boost of the coupling strength comes at the cost of a “linearized” (effectively semiclassical) dynamics. Here, we instead demonstrate a new approach for enhancing the coupling constant of a single quantum emitter, while retaining the nonlinear character of the light-matter interaction. We consider a single quantum emitter with N nearly degenerate transitions that are collectively coupled to the same field mode. We show that in such conditions an effective Jaynes-Cummings model emerges with a boosted coupling constant of order √N. The validity and consequences of our general conclusions are analytically demonstrated for the instructive case N=2. We further observe that our system can closely match the spectral line shapes and photon autocorrelation functions typical of Jaynes-Cummings physics, proving that quantum optical nonlinearities are retained. Our findings match up very well with recent broadband plasmonic nanoresonator strong-coupling experiments and will, therefore, facilitate the control and detection of single-photon nonlinearities at ambient conditions.},
  author = {Tufarelli, Tommaso and Friedrich, Daniel and Groß, Heiko and Hamm, Joachim and Hess, Ortwin and Hecht, Bert},
  journal = {Phys. Rev. Research},
  keywords = {light-matter-interaction multilevel nano-optics strong-coupling theory},
  month = {07},
  note = {<a href="https://arxiv.org/abs/2010.12585v2" style="font-style: normal;">&raquo; arXiv: 2010.12585v2 (2021)</a>.},
  title = {Single quantum emitter Dicke enhancement},
  year = 2021
}

Near-infrared nanospectroscopy using a low-noise supercontinuum source. Kaltenecker, Korbinian J.; S., Shreesha Rao D.; Rasmussen, Mattias; Lassen, Henrik B.; Kelleher, Edmund J. R.; Krauss, Enno; Hecht, Bert; Mortensen, N. Asger; Grüner-Nielsen, Lars; Markos, Christos; Bang, Ole; Stenger, Nicolas; Jepsen, Peter Uhd in APL Photonics (2021). 6(6) 066106.

[ Abstract ] [ BibTeX ] [ EndNote ] [ URL ] [ DOI ]

@article{Kaltenecker_2021,
  abstract = {Unlocking the true potential of optical spectroscopy on the nanoscale requires development of stable and low-noise laser sources. Here, we have developed a low-noise supercontinuum (SC) source based on an all-normal dispersion fiber pumped by a femtosecond fiber laser and demonstrate high resolution, spectrally resolved near-field measurements in the near-infrared (NIR) region. Specifically, we explore the reduced-noise requirements for aperture-less scattering-type scanning near-field optical microscopy (s-SNOM), including inherent pulse-to-pulse fluctuation of the SC. We use our SC light source to demonstrate the first NIR, spectrally resolved s-SNOM measurement, a situation where state-of-the-art commercial SC sources are too noisy to be useful. We map the propagation of surface plasmon polariton (SPP) waves on monocrystalline gold platelets in the wavelength region of 1.34–1.75 μm in a single measurement, thereby characterizing experimentally the dispersion curve of the SPP in the NIR. Our results represent a technological breakthrough that has the potential to enable a wide range of new applications of low-noise SC sources in near-field studies.},
  author = {Kaltenecker, Korbinian J. and S., Shreesha Rao D. and Rasmussen, Mattias and Lassen, Henrik B. and Kelleher, Edmund J. R. and Krauss, Enno and Hecht, Bert and Mortensen, N. Asger and Grüner-Nielsen, Lars and Markos, Christos and Bang, Ole and Stenger, Nicolas and Jepsen, Peter Uhd},
  journal = {{APL} Photonics},
  keywords = {experiment infrared nano-optics nanospectroscopy near-field plasmon},
  month = {jun},
  number = 6,
  pages = {066106},
  publisher = {{AIP} Publishing},
  title = {Near-infrared nanospectroscopy using a low-noise supercontinuum source},
  volume = 6,
  year = 2021
}

The patterning toolbox FIB-o-mat: Exploiting the full potential of focused helium ions for nanofabrication. Deinhart, Victor; Kern, Lisa-Marie; Kirchhof, Jan N; Juergensen, Sabrina; Sturm, Joris; Krauss, Enno; Feichtner, Thorsten; Kovalchuk, Sviatoslav; Schneider, Michael; Engel, Dieter; Pfau, Bastian; Hecht, Bert; Bolotin, Kirill I; Reich, Stephanie; Höflich, Katja in Beilstein Journal of Nanotechnology (2021). 12 304–318.

[ Abstract ] [ BibTeX ] [ EndNote ] [ URL ] [ DOI ]

Nanoscale Electrical Excitation of Distinct Modes in Plasmonic Waveguides. Ochs, Maximilian; Zurak, Luka; Krauss, Enno; Meier, Jessica; Emmerling, Monika; Kullock, René; Hecht, Bert in Nano Letters (2021).

[ Abstract ] [ BibTeX ] [ EndNote ] [ URL ] [ DOI ]

Driving plasmonic nanoantennas at perfect impedance matching using generalized coherent perfect absorption. Grimm, Philipp; Razinskas, Gary; Huang, Jer-Shing; Hecht, Bert in nanoph-2021-0048 (2021).

» arXiv: 1907.08174 (2020)

[ Abstract ] [ BibTeX ] [ EndNote ] [ URL ] [ DOI ]

Electrically-driven Yagi-Uda antennas for light. Kullock, René; Ochs, Maximilian; Grimm, Philipp; Emmerling, Monika; Hecht, Bert in Nat Commun (2020). 11(1) 1–7.

press:
pro-physik.de, elektronik-informationen.de, photonics.com, sciencedaily.com, laboratory-journal.com, phys.org, nanowerk.com, Gold Nanoparticles (nanopartz), innovations-report.com, bestresearchreports.com, trendintech.com, electronicsonline.net, idw-online.de, scitechdaily.com, advancedsciencenews.com

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

@article{kullock2020electricallydriven,
  abstract = {Yagi-Uda antennas are a key technology for efficiently transmitting information from point to point using radio waves. Since higher frequencies allow higher bandwidths and smaller footprints, a strong incentive exists to shrink Yagi-Uda antennas down to the optical regime. Here we demonstrate electrically-driven Yagi-Uda antennas for light with wavelength-scale footprints that exhibit large directionalities with forward-to-backward ratios of up to 9.1 dB. Light generation is achieved via antenna-enhanced inelastic tunneling of electrons over the antenna feed gap. We obtain reproducible tunnel gaps by means of feedback-controlled dielectrophoresis, which precisely places single surface-passivated gold nanoparticles in the antenna gap. The resulting antennas perform equivalent to radio-frequency antennas and combined with waveguiding layers even outperform RF designs. This work paves the way for optical on-chip data communication that is not restricted by Joule heating but also for advanced light management in nanoscale sensing and metrology as well as light emitting devices.},
  author = {Kullock, René and Ochs, Maximilian and Grimm, Philipp and Emmerling, Monika and Hecht, Bert},
  journal = {Nat Commun},
  keywords = {SEM antenna experiment nano-optics waveguides},
  month = {01},
  note = {<i style="font-style: normal;"><b>press:</b><br> <a href="https://www.pro-physik.de/nachrichten/nano-antennen-fuer-den-datentransfer">pro-physik.de</a>, <a href="https://www.elektronik-informationen.de/nanoantennen-fuer-den-datentransfer/150/23202/398077">elektronik-informationen.de</a>, <a href="https://www.photonics.com/Articles/Nanoantennas_for_Data_Transfer/a65445">photonics.com</a>, <a href="https://www.sciencedaily.com/releases/2020/01/200108074755.htm">sciencedaily.com</a>, <a href="https://www.laboratory-journal.com/news/scientific-news/nano-antennas-data-transfer">laboratory-journal.com</a>, <a href="https://phys.org/news/2020-01-nano-antennas.html">phys.org</a>, <a href="https://www.nanowerk.com/nanotechnology-news2/newsid=54323.php">nanowerk.com</a>, <a href="https://www.nanopartz.com/Customer-Spotlight/Wuerzburg-Antennas.asp">Gold Nanoparticles (nanopartz)</a>, <a href="https://www.innovations-report.com/html/reports/energy-engineering/nano-antennas-for-data-transfer.html">innovations-report.com</a>, <a href="https://bestresearchreports.com/2020/01/30/nano-antennas-for-data-transfer/">bestresearchreports.com</a>, <a href="http://trendintech.com/2020/01/25/wurzburg-physicists-develop-the-worlds-first-directional-antenna-for-light/">trendintech.com</a>, <a href="https://www.electronicsonline.net.au/content/components/news/nano-antennas-enable-data-transfer-1514775135#axzz6Cba5BvX6">electronicsonline.net</a>, <a href="https://idw-online.de/de/news729582">idw-online.de</a>, <a href="https://scitechdaily.com/nano-antennas-for-data-transfer-could-allow-processor-cores-to-exchange-data-at-speed-of-light/">scitechdaily.com</a>, <a href="https://www.advancedsciencenews.com/nano-scale-antennas-for-optical-data-communication/">advancedsciencenews.com</a></i>},
  number = 1,
  pages = {1-7},
  title = {Electrically-driven Yagi-Uda antennas for light},
  volume = 11,
  year = 2020
}

Mono-crystalline gold platelets: a high-quality platform for surface plasmon polaritons. Kaltenecker, Korbinian J.; Krauss, Enno; Casses, Laura; Geisler, Mathias; Hecht, Bert; Mortensen, N. Asger; Jepsen, Peter Uhd; Stenger, Nicolas in Nanophotonics (2020). 9(2) 509–522.

» arxiv:1909.08321 (2020)

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Space- and time-resolved UV-to-NIR surface spectroscopy and 2D nanoscopy at 1 MHz repetition rate. Huber, Bernhard; Pres, Sebastian; Wittmann, Emanuel; Dietrich, Lysanne; Lüttig, Julian; Fersch, Daniel; Krauss, Enno; Friedrich, Daniel; Kern, Johannes; Lisinetskii, Victor; Hensen, Matthias; Hecht, Bert; Bratschitsch, Rudolf; Riedle, Eberhard; Brixner, Tobias in Rev. Sci. Instrum. (2019). 90(11) 113103.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

@article{huber2019space,
  abstract = {We describe a setup for time-resolved photoemission electron microscopy with aberration correction enabling 3 nm spatial resolution and sub-20 fs temporal resolution. The latter is realized by our development of a widely tunable (215–970 nm) noncollinear optical parametric amplifier (NOPA) at 1 MHz repetition rate. We discuss several exemplary applications. Efficient photoemission from plasmonic Au nanoresonators is investigated with phase-coherent pulse pairs from an actively stabilized interferometer. More complex excitation fields are created with a liquid-crystal-based pulse shaper enabling amplitude and phase shaping of NOPA pulses with spectral components from 600 to 800 nm. With this system we demonstrate spectroscopy within a single plasmonic nanoslit resonator by spectral amplitude shaping and investigate the local field dynamics with coherent two-dimensional (2D) spectroscopy at the nanometer length scale (“2D nanoscopy”). We show that the local response varies across a distance as small as 33 nm in our sample. Further, we report two-color pump–probe experiments using two independent NOPA beamlines. We extract local variations of the excited-state dynamics of a monolayered 2D material (WSe2) that we correlate with low-energy electron microscopy (LEEM) and reflectivity measurements. Finally, we demonstrate the in situ sample preparation capabilities for organic thin films and their characterization via spatially resolved electron diffraction and dark-field LEEM.},
  author = {Huber, Bernhard and Pres, Sebastian and Wittmann, Emanuel and Dietrich, Lysanne and Lüttig, Julian and Fersch, Daniel and Krauss, Enno and Friedrich, Daniel and Kern, Johannes and Lisinetskii, Victor and Hensen, Matthias and Hecht, Bert and Bratschitsch, Rudolf and Riedle, Eberhard and Brixner, Tobias},
  journal = {Rev. Sci. Instrum.},
  keywords = {experiment nano-optics plasmon spectroscopy},
  month = 11,
  number = 11,
  pages = 113103,
  title = {Space- and time-resolved UV-to-NIR surface spectroscopy and 2D nanoscopy at 1 MHz repetition rate},
  volume = 90,
  year = 2019
}

%0 Journal Article
%1 huber2019space
%A Huber, Bernhard
%A Pres, Sebastian
%A Wittmann, Emanuel
%A Dietrich, Lysanne
%A Lüttig, Julian
%A Fersch, Daniel
%A Krauss, Enno
%A Friedrich, Daniel
%A Kern, Johannes
%A Lisinetskii, Victor
%A Hensen, Matthias
%A Hecht, Bert
%A Bratschitsch, Rudolf
%A Riedle, Eberhard
%A Brixner, Tobias
%D 2019
%J Rev. Sci. Instrum.
%N 11
%P 113103
%R 10.1063/1.5115322
%T Space- and time-resolved UV-to-NIR surface spectroscopy and 2D nanoscopy at 1 MHz repetition rate
%V 90
%X We describe a setup for time-resolved photoemission electron microscopy with aberration correction enabling 3 nm spatial resolution and sub-20 fs temporal resolution. The latter is realized by our development of a widely tunable (215–970 nm) noncollinear optical parametric amplifier (NOPA) at 1 MHz repetition rate. We discuss several exemplary applications. Efficient photoemission from plasmonic Au nanoresonators is investigated with phase-coherent pulse pairs from an actively stabilized interferometer. More complex excitation fields are created with a liquid-crystal-based pulse shaper enabling amplitude and phase shaping of NOPA pulses with spectral components from 600 to 800 nm. With this system we demonstrate spectroscopy within a single plasmonic nanoslit resonator by spectral amplitude shaping and investigate the local field dynamics with coherent two-dimensional (2D) spectroscopy at the nanometer length scale (“2D nanoscopy”). We show that the local response varies across a distance as small as 33 nm in our sample. Further, we report two-color pump–probe experiments using two independent NOPA beamlines. We extract local variations of the excited-state dynamics of a monolayered 2D material (WSe2) that we correlate with low-energy electron microscopy (LEEM) and reflectivity measurements. Finally, we demonstrate the in situ sample preparation capabilities for organic thin films and their characterization via spatially resolved electron diffraction and dark-field LEEM.

Evidence for cascaded third harmonic generation in non-centrosymmetric gold nanoantennas. Celebrano, Michele; Locatelli, Andrea; Ghirardini, Lavinia; Pellegrini, Giovanni; Biagioni, Paolo; Zilli, Attilio; Wu, Xiaofei; Grossmann, Swen; Carletti, Luca; De Angelis, Costantino; Duò, Lamberto; Hecht, Bert; Finazzi, Marco in Nano Lett. (2019). 19(10) 7013–7020.

» arXiv:1803.03617 (2018)

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

@article{celebrano2019evidence,
  abstract = {The optimization of nonlinear optical processes on the nanoscale is a crucial step for the integration of complex functionalities into compact photonic devices and metasurfaces. In such systems, photon upconversion can be achieved with higher efficiencies via third-order processes, such as third-harmonic generation (THG), thanks to the resonantly enhanced volume currents. Conversely, second-order processes, such as second-harmonic generation (SHG), are often inhibited by the symmetry of metal lattices and of common nanoantenna geometries. SHG and THG processes in plasmonic nanostructures are generally treated independently because they typically represent small perturbations in the light–matter interaction mechanisms. In this work, we demonstrate that this paradigm does not hold for plasmon-enhanced nonlinear optics by providing evidence of a sum-frequency generation (SFG) process seeded by SHG, which sizably contributes to the overall THG yield. We address this mechanism by unveiling a characteristic fingerprint in the polarization state of the THG emission from gold noncentrosymmetric nanoantennas, which directly reflects the asymmetric distribution of second-harmonic fields within the structure and does not depend on the model one employs to describe photon upconversion. We suggest that such cascaded processes may also appear for structures that exhibit only moderate SHG yields. The presence of this peculiar mechanism in THG from plasmonic nanoantennas at telecommunication wavelengths allows us to gain further insight into the physics of plasmon-enhanced nonlinear optical processes. This could be crucial in the realization of nanoscale elements for photon conversion and manipulation operating at room temperature.},
  author = {Celebrano, Michele and Locatelli, Andrea and Ghirardini, Lavinia and Pellegrini, Giovanni and Biagioni, Paolo and Zilli, Attilio and Wu, Xiaofei and Grossmann, Swen and Carletti, Luca and De Angelis, Costantino and Duò, Lamberto and Hecht, Bert and Finazzi, Marco},
  journal = {Nano Lett.},
  keywords = {SHG THG antenna experiment gold nano-optics plasmon},
  month = 10,
  note = {<a href="https://arxiv.org/abs/1803.03617" style="font-style: normal;">&raquo; arXiv:1803.03617 (2018)</a>},
  number = 10,
  pages = {7013-7020},
  title = {Evidence for cascaded third harmonic generation in non-centrosymmetric gold nanoantennas},
  volume = 19,
  year = 2019
}

%0 Journal Article
%1 celebrano2019evidence
%A Celebrano, Michele
%A Locatelli, Andrea
%A Ghirardini, Lavinia
%A Pellegrini, Giovanni
%A Biagioni, Paolo
%A Zilli, Attilio
%A Wu, Xiaofei
%A Grossmann, Swen
%A Carletti, Luca
%A De Angelis, Costantino
%A Duò, Lamberto
%A Hecht, Bert
%A Finazzi, Marco
%D 2019
%J Nano Lett.
%N 10
%P 7013-7020
%R 10.1021/acs.nanolett.9b02427
%T Evidence for cascaded third harmonic generation in non-centrosymmetric gold nanoantennas
%V 19
%X The optimization of nonlinear optical processes on the nanoscale is a crucial step for the integration of complex functionalities into compact photonic devices and metasurfaces. In such systems, photon upconversion can be achieved with higher efficiencies via third-order processes, such as third-harmonic generation (THG), thanks to the resonantly enhanced volume currents. Conversely, second-order processes, such as second-harmonic generation (SHG), are often inhibited by the symmetry of metal lattices and of common nanoantenna geometries. SHG and THG processes in plasmonic nanostructures are generally treated independently because they typically represent small perturbations in the light–matter interaction mechanisms. In this work, we demonstrate that this paradigm does not hold for plasmon-enhanced nonlinear optics by providing evidence of a sum-frequency generation (SFG) process seeded by SHG, which sizably contributes to the overall THG yield. We address this mechanism by unveiling a characteristic fingerprint in the polarization state of the THG emission from gold noncentrosymmetric nanoantennas, which directly reflects the asymmetric distribution of second-harmonic fields within the structure and does not depend on the model one employs to describe photon upconversion. We suggest that such cascaded processes may also appear for structures that exhibit only moderate SHG yields. The presence of this peculiar mechanism in THG from plasmonic nanoantennas at telecommunication wavelengths allows us to gain further insight into the physics of plasmon-enhanced nonlinear optical processes. This could be crucial in the realization of nanoscale elements for photon conversion and manipulation operating at room temperature.

Spatial Variations in Femtosecond Field Dynamics within a Plasmonic Nanoresonator Mode. Hensen, Matthias; Huber, Bernhard; Friedrich, Daniel; Krauss, Enno; Pres, Sebastian; Grimm, Philipp; Fersch, Daniel; Lüttig, Julian; Lisinetskii, Victor; Hecht, Bert; Brixner, Tobias in Nano Lett. (2019). 19(7) 4651–4658.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Nonclassical Optical Properties of Mesoscopic Gold. Großmann, Swen; Friedrich, Daniel; Karolak, Michael; Kullock, René; Krauss, Enno; Emmerling, Monika; Sangiovanni, Giorgio; Hecht, Bert in Phys. Rev. Lett. (2019). 122(24) 246802.

» arxiv:1905.09942 (2019)

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Reversible Mapping and Sorting the Spin of Photons on the Nanoscale: A Spin-Optical Nanodevice. Krauss, Enno; Razinskas, Gary; Köck, Dominik; Grossmann, Swen; Hecht, Bert in Nano Lett. (2019). 19(5) 3364–3369.

» arxiv:1812.03721 (2018)

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Interference in edge-scattering from monocrystalline gold flakes [Invited]. Boroviks, Sergejs; Wolff, Christian; Linnet, Jes; Yang, Yuanqing; Todisco, Francesco; Roberts, Alexander S.; Bozhevolnyi, Sergey I.; Hecht, Bert; Mortensen, N. Asger in Opt. Mater. Express (2018). 8(12) 3688–3697.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

High-Q, low-mode-volume and multiresonant plasmonic nanoslit cavities fabricated by helium ion milling. Chen, Kai; Razinskas, Gary; Vieker, Henning; Gross, Heiko; Wu, Xiaofei; Beyer, André; Gölzhäuser, Armin; Hecht, Bert in Nanoscale (2018). 10(36) 17148–17155.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Parallel mapping of optical near-field interactions by molecular motor-driven quantum dots. Groß, Heiko; Heil, Hannah S.; Ehrig, Jens; Schwarz, Friedrich W.; Hecht, Bert; Diez, Stefan in Nature Nanotech. (2018). 13(8) 691–695.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

@article{gro2018parallel,
  abstract = {In the vicinity of metallic nanostructures, absorption and emission rates of optical emitters can be modulated by several orders of magnitude. Control of such near-field light–matter interaction is essential for applications in biosensing, light harvesting and quantum communication and requires precise mapping of optical near-field interactions, for which single-emitter probes are promising candidates. However, currently available techniques are limited in terms of throughput, resolution and/or non-invasiveness. Here, we present an approach for the parallel mapping of optical near-field interactions with a resolution of {\textless}5 nm using surface-bound motor proteins to transport microtubules carrying single emitters (quantum dots). The deterministic motion of the quantum dots allows for the interpolation of their tracked positions, resulting in an increased spatial resolution and a suppression of localization artefacts. We apply this method to map the near-field distribution of nanoslits engraved into gold layers and find an excellent agreement with finite-difference time-domain simulations. Our technique can be readily applied to a variety of surfaces for scalable, nanometre-resolved and artefact-free near-field mapping using conventional wide-field microscopes.},
  author = {Groß, Heiko and Heil, Hannah S. and Ehrig, Jens and Schwarz, Friedrich W. and Hecht, Bert and Diez, Stefan},
  journal = {Nature Nanotech.},
  keywords = {Qdot experiment nano-optics near-field},
  month = {04},
  number = 8,
  pages = {691-695},
  title = {Parallel mapping of optical near-field interactions by molecular motor-driven quantum dots},
  volume = 13,
  year = 2018
}

Gap-mode-assisted light-induced switching of sub-wavelength magnetic domains. Scheunert, G.; McCarron, R.; Kullock, R.; Cohen, S. R.; Rechav, K.; Kaplan-Ashiri, I.; Bitton, O.; Hecht, B.; Oron, D. in J. Appl. Phys. (2018). 123(14) 143102.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

@article{scheunert2018gapmodeassisted,
  abstract = {Creating sub-micron hotspots for applications such as heat-assisted magnetic recording (HAMR) is a challenging task. The most common approach relies on a surface-plasmon resonator (SPR), whose design dictates the size of the hotspot to always be larger than its critical dimension. Here, we present an approach which circumvents known geometrica restrictions by resorting to electric field confinement via excitation of a gap-mode (GM) between a comparatively large Gold (Au) nano-sphere (radius of 100 nm) and the magnetic medium in a grazing-incidence configuration. Operating a λ=785 nm laser, sub-200 nm hot spots have been generated and successfully used for GM-assisted magnetic switching on commercial CoCrPt perpendicular magnetic recording media at laser powers and pulse durations comparable to SPR-based HAMR. Lumerical electric field modelling confirmed that operating in the near-infrared regime presents a suitable working point where most of the light's energy is deposited in the magnetic layer, rather than in the nano-particle. Further, modelling is used for predicting the limits of our method which, in theory, can yield sub-30 nm hotspots for Au nano-sphere radii of 25–50 nm for efficient heating of FePt recording media with a gap of 5 nm.},
  author = {Scheunert, G. and McCarron, R. and Kullock, R. and Cohen, S. R. and Rechav, K. and Kaplan-Ashiri, I. and Bitton, O. and Hecht, B. and Oron, D.},
  journal = {J. Appl. Phys.},
  keywords = {MFM antenna experiment magnetic-recording nano-optics plasmon},
  month = {04},
  number = 14,
  pages = 143102,
  title = {Gap-mode-assisted light-induced switching of sub-wavelength magnetic domains},
  volume = 123,
  year = 2018
}

Near-field strong coupling of single quantum dots. Groß, Heiko; Hamm, Joachim M.; Tufarelli, Tommaso; Hess, Ortwin; Hecht, Bert in Science Advances (2018). 4(3) eaar4906.

» BR2 - IQ Wissenschaft und Forschung - Magazin (min 19:51)

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Controlled Growth of High-Aspect-Ratio Single-Crystalline Gold Platelets. Krauss, Enno; Kullock, René; Wu, Xiaofei; Geisler, Peter; Lundt, Nils; Kamp, Martin; Hecht, Bert in Cryst. Growth Des. (2018). 18(3) 1297–1302.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Directed emission by electrically driven optical antennas. Kullock, René; Grimm, Philipp; Ochs, Maximilian; Hecht, Bert in SPIE OPTO (2018). 10540 1054012.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Limits of Kirchhoff’s Laws in Plasmonics. Razinskas, Gary; Biagioni, Paolo; Hecht, Bert in Sci Rep (2018). 8(1) 1–9.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Mode Matching for Optical Antennas. Feichtner, Thorsten; Christiansen, Silke; Hecht, Bert in Phys. Rev. Lett. (2017). 119(21) 217401.

» arXiv:1611.05399 (2016)

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Cavity-assisted ultrafast long-range periodic energy transfer between plasmonic nanoantennas. Aeschlimann, Martin; Brixner, Tobias; Cinchetti, Mirko; Frisch, Benjamin; Hecht, Bert; Hensen, Matthias; Huber, Bernhard; Kramer, Christian; Krauss, Enno; Loeber, Thomas H.; Pfeiffer, Walter; Piecuch, Martin; Thielen, Philip in Light Sci Appl (2017). 6(11) e17111.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

@article{aeschlimann2017cavityassisted,
  abstract = {Radiationless energy transfer is at the core of diverse phenomena, such as light harvesting in photosynthesis, energy-transfer-based microspectroscopies, nanoscale quantum entanglement and photonic-mode hybridization. Typically, the transfer is efficient only for separations that are much shorter than the diffraction limit. This hampers its application in optical communication and quantum information processing, which require spatially selective addressing. Here, we demonstrate highly efficient radiationless coherent energy transfer over a distance of twice the excitation wavelength by combining localized and delocalized plasmonic modes. Analogous to the Tavis–Cummings model, two whispering-gallery-mode antennas placed in the foci of an elliptical plasmonic cavity fabricated from single-crystal gold plates act as a pair of oscillators coupled to a common cavity mode. Time-resolved two-photon photoemission electron microscopy (TR 2P-PEEM) reveals an ultrafast long-range periodic energy transfer in accordance with the simulations. Our observations open perspectives for the optimization and tailoring of mesoscopic energy transfer and long-range quantum emitter coupling.},
  author = {Aeschlimann, Martin and Brixner, Tobias and Cinchetti, Mirko and Frisch, Benjamin and Hecht, Bert and Hensen, Matthias and Huber, Bernhard and Kramer, Christian and Krauss, Enno and Loeber, Thomas H. and Pfeiffer, Walter and Piecuch, Martin and Thielen, Philip},
  journal = {Light Sci Appl},
  keywords = {antenna experiment gold nano-optics plasmon},
  month = 11,
  number = 11,
  pages = {e17111},
  title = {Cavity-assisted ultrafast long-range periodic energy transfer between plasmonic nanoantennas},
  volume = 6,
  year = 2017
}

On-Chip Single-Plasmon Nanocircuit Driven by a Self-Assembled Quantum Dot. Wu, Xiaofei; Jiang, Ping; Razinskas, Gary; Huo, Yongheng; Zhang, Hongyi; Kamp, Martin; Rastelli, Armando; Schmidt, Oliver G.; Hecht, Bert; Lindfors, Klas; Lippitz, Markus in Nano Lett. (2017). 17(7) 4291–4296.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Transmission of Plasmons through a Nanowire. Geisler, Peter; Krauss, Enno; Razinskas, Gary; Hecht, Bert in ACS Photonics (2017). 4(7) 1615–1620.

» arXiv:1702.03103 (2017)

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Three-dimensional photonic confinement in imprinted liquid crystalline pillar microcavities. Dusel, Marco; Betzold, Simon; Brodbeck, Sebastian; Herbst, Stefanie; Würthner, Frank; Friedrich, Daniel; Hecht, Bert; Höfling, Sven; Dietrich, Christof P. in Appl. Phys. Lett. (2017). 110(20) 201113.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Plasmonic nanoantenna design and fabrication based on evolutionary optimization. Feichtner, Thorsten; Selig, Oleg; Hecht, Bert in Opt. Express (2017). 25(10) 10828–10842.

» arXiv: 1511.05438 (2016)

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Grazing-incidence optical magnetic recording with super-resolution. Scheunert, Gunther; Cohen, Sidney R.; Kullock, René; McCarron, Ryan; Rechev, Katya; Kaplan-Ashiri, Ifat; Bitton, Ora; Dawson, Paul; Hecht, Bert; Oron, Dan in Beilstein J. Nanotechnol. (2017). 8(1) 28–37.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

@article{scheunert2017grazingincidence,
  abstract = {Heat-assisted magnetic recording (HAMR) is often considered the next major step in the storage industry: it is predicted to increase the storage capacity, the read/write speed and the data lifetime of future hard disk drives. However, despite more than a decade of development work, the reliability is still a prime concern. Featuring an inherently fragile surface-plasmon resonator as a highly localized heat source, as part of a near-field transducer (NFT), the current industry concepts still fail to deliver drives with sufficient lifetime. This study presents a method to aid conventional NFT-designs by additional grazing-incidence laser illumination, which may open an alternative route to high-durability HAMR. Magnetic switching is demonstrated on consumer-grade CoCrPt perpendicular magnetic recording media using a green and a near-infrared diode laser. Sub-500 nm magnetic features are written in the absence of a NFT in a moderate bias field of only μ0H = 0.3 T with individual laser pulses of 40 mW power and 50 ns duration with a laser spot size of 3 μm (short axis) at the sample surface – six times larger than the magnetic features. Herein, the presence of a nanoscopic object, i.e., the tip of an atomic force microscope in the focus of the laser at the sample surface, has no impact on the recorded magnetic features – thus suggesting full compatibility with NFT-HAMR.},
  author = {Scheunert, Gunther and Cohen, Sidney R. and Kullock, René and McCarron, Ryan and Rechev, Katya and Kaplan-Ashiri, Ifat and Bitton, Ora and Dawson, Paul and Hecht, Bert and Oron, Dan},
  journal = {Beilstein J. Nanotechnol.},
  keywords = {experiment magnetic-recording nano-optics},
  month = {01},
  number = 1,
  pages = {28-37},
  title = {Grazing-incidence optical magnetic recording with super-resolution},
  volume = 8,
  year = 2017
}

Normal-Incidence PEEM Imaging of Propagating Modes in a Plasmonic Nanocircuit. Razinskas, Gary; Kilbane, Deirdre; Melchior, Pascal; Geisler, Peter; Krauss, Enno; Mathias, Stefan; Hecht, Bert; Aeschlimann, Martin in Nano Lett. (2016). 16(11) 6832–6837.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Two-photon polymerization setup enables experimental mapping and correction of spherical aberrations for improved macroscopic structure fabrication. Stichel, Thomas; Hecht, Bert; Steenhusen, Sönke; Houbertz, Ruth; Sextl, Gerhard in Opt. Lett. (2016). 41(18) 4269–4272.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Polarization dependence of plasmonic near-field enhanced photoemission from cross antennas. Klaer, P.; Razinskas, G.; Lehr, M.; Wu, X.; Hecht, B.; Schertz, F.; Butt, H.-J.; Schönhense, G.; Elmers, H. J. in Appl. Phys. B (2016). 122(5) 136.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Electromechanically Tunable Suspended Optical Nanoantenna. Chen, Kai; Razinskas, Gary; Feichtner, Thorsten; Grossmann, Swen; Christiansen, Silke; Hecht, Bert in Nano Lett. (2016). 16(4) 2680–2685.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

$Investigation of the nonlinear refractive index of single-crystalline thin gold films and plasmonic nanostructures$

Investigation of the nonlinear refractive index of single-crystalline thin gold films and plasmonic nanostructures. Goetz, Sebastian; Razinskas, Gary; Krauss, Enno; Dreher, Christian; Wurdack, Matthias; Geisler, Peter; Pawłowska, Monika; Hecht, Bert; Brixner, Tobias in Appl. Phys. B (2016). 122(4) 94.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

@article{goetz2016investigation,
  abstract = {The nonlinear refractive index of plasmonic materials may be used to obtain nonlinear functionality, e.g., power-dependent switching. Here, we investigate the nonlinear refractive index of single-crystalline gold in thin layers and nanostructures on dielectric substrates. In a first step, we implement a z-scan setup to investigate &nbsp;100-µm-sized thin-film samples. We determine the nonlinear refractive index of fused silica, n2(SiO2) = 2.9 × 10^(−20) m^2/W, in agreement with literature values. Subsequent z-scan measurements of single-crystalline gold films reveal a damage threshold of 0.22 TW/cm^2 and approximate upper limits of the real and imaginary parts of the nonlinear refractive index, |n2′(Au)| < 1.2 × 10^(−16) m^2/W and |n2″(Au)| < 0.6 × 10^(−16) m^2/W, respectively. To further determine possible effects of a nonlinear refractive index in plasmonic circuitry, interferometry is proposed as a phase-sensitive probe. In corresponding nanostructures, relative phase changes between two propagating near-field modes are converted to amplitude changes by mode interference. Power-dependent experiments using sub-10-fs near-infrared pulses and diffraction-limited resolution (NA = 1.4) reveal linear behavior up to the damage threshold (0.23 times relative to that of a solid single-crystalline gold film). An upper limit for the nonlinear power-dependent phase change between two propagating near-field modes is determined to Δφ < 0.07 rad.},
  author = {Goetz, Sebastian and Razinskas, Gary and Krauss, Enno and Dreher, Christian and Wurdack, Matthias and Geisler, Peter and Pawłowska, Monika and Hecht, Bert and Brixner, Tobias},
  journal = {Appl. Phys. B},
  keywords = {experiment gold nano-optics plasmon},
  month = {04},
  number = 4,
  pages = 94,
  title = {Investigation of the nonlinear refractive index of single-crystalline thin gold films and plasmonic nanostructures},
  volume = 122,
  year = 2016
}

Nanoscale Confinement of All-Optical Magnetic Switching in TbFeCo - Competition with Nanoscale Heterogeneity. Liu, Tian-Min; Wang, Tianhan; Reid, Alexander H.; Savoini, Matteo; Wu, Xiaofei; Koene, Benny; Granitzka, Patrick; Graves, Catherine E.; Higley, Daniel J.; Chen, Zhao; Razinskas, Gary; Hantschmann, Markus; Scherz, Andreas; Stöhr, Joachim; Tsukamoto, Arata; Hecht, Bert; Kimel, Alexey V.; Kirilyuk, Andrei; Rasing, Theo; Dürr, Hermann A. in Nano Lett. (2015). 15(10) 6862–6868.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Silica–gold bilayer-based transfer of focused ion beam-fabricated nanostructures. Wu, Xiaofei; Geisler, Peter; Krauss, Enno; Kullock, René; Hecht, Bert in Nanoscale (2015). 7(39) 16427–16433.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Electrically driven optical antennas. Kern, Johannes; Kullock, René; Prangsma, Jord; Emmerling, Monika; Kamp, Martin; Hecht, Bert in Nature Photon (2015). 9(9) 582–586.

» arxiv:1502.04935
press:
» Die Welt (in german), » spektrum.de (in german), » Physik in unserer Zeit (in german)

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

@article{kern2015electrically,
  abstract = {Unlike radiowave antennas, so far optical nanoantennas cannot be fed by electrical generators. Instead, they are driven by light or indirectly via excited discrete states in active materials in their vicinity. Here we demonstrate the direct electrical driving of an in-plane optical antenna by the broadband quantum-shot noise of electrons tunnelling across its feed gap. The spectrum of the emitted photons is determined by the antenna geometry and can be tuned via the applied voltage. Moreover, the direction and polarization of the light emission are controlled by the antenna resonance, which also improves the external quantum efficiency by up to two orders of magnitude. The one-material planar design offers facile integration of electrical and optical circuits and thus represents a new paradigm for interfacing electrons and photons at the nanometre scale, for example for on-chip wireless communication and highly configurable electrically driven subwavelength photon sources.},
  author = {Kern, Johannes and Kullock, René and Prangsma, Jord and Emmerling, Monika and Kamp, Martin and Hecht, Bert},
  journal = {Nature Photon},
  keywords = {IV-measurements antenna experiment nano-optics},
  month = {08},
  note = {<i style="font-style: normal;"><a href="https://arxiv.org/abs/1502.04935">&raquo; arxiv:1502.04935</a><br> <b>press:</b><br><a href="https://www.welt.de/print/die_welt/wissen/article146060578/Smartphone-fuer-Adleraugen.html">&raquo; Die Welt</a> (in german), <a href="http://www.spektrum.de/news/erste-elektrisch-betriebene-lichtantenne-der-welt/1361113">&raquo; spektrum.de</a> (in german), <a href="http://onlinelibrary.wiley.com/doi/10.1002/piuz.201590100/abstract">&raquo; Physik in unserer Zeit</a> (in german)</i>},
  number = 9,
  pages = {582-586},
  title = {Electrically driven optical antennas},
  volume = 9,
  year = 2015
}

Single-crystalline gold microplates grown on substrates by solution-phase synthesis. Wu, Xiaofei; Kullock, René; Krauss, Enno; Hecht, Bert in Cryst. Res. Technol. (2015). 50(8) 595–602.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Robustness of plasmonic angular momentum confinement in cross resonant optical antennas. Klaer, Peter; Razinskas, Gary; Lehr, Martin; Krewer, Keno; Schertz, Florian; Wu, Xiao-Fei; Hecht, Bert; Schönhense, Gerd; Elmers, Hans Joachim in Appl. Phys. Lett. (2015). 106(26) 261101.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Mode matching in multiresonant plasmonic nanoantennas for enhanced second harmonic generation. Celebrano, Michele; Wu, Xiaofei; Baselli, Milena; Großmann, Swen; Biagioni, Paolo; Locatelli, Andrea; Angelis, Costantino De; Cerullo, Giulio; Osellame, Roberto; Hecht, Bert; Duò, Lamberto; Ciccacci, Franco; Finazzi, Marco in Nature Nanotech. (2015). 10(5) 412–417.

» arxiv:1412.0698

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

@article{celebrano2015matching,
  abstract = {Boosting nonlinear frequency conversion in extremely confined volumes remains a challenge in nano-optics research, but can enable applications in nanomedicine, photocatalysis and background-free biosensing. To obtain brighter nonlinear nanoscale sources, approaches that enhance the electromagnetic field intensity and counter the lack of phase matching in nanoplasmonic systems are often employed. However, the high degree of symmetry in the crystalline structure of plasmonic materials (metals in particular) and in nanoantenna designs strongly quenches second harmonic generation. Here, we describe doubly-resonant single-crystalline gold nanostructures with no axial symmetry displaying spatial mode overlap at both the excitation and second harmonic wavelengths. The combination of these features allows the attainment of a nonlinear coefficient for second harmonic generation of ∼5 × 10{\textasciicircum}(–10) W{\textasciicircum}(–1), enabling a second harmonic photon yield higher than 3 × 10{\textasciicircum}6 photons per second. Theoretical estimations point toward the use of our nonlinear plasmonic nanoantennas as efficient platforms for label-free molecular sensing.},
  author = {Celebrano, Michele and Wu, Xiaofei and Baselli, Milena and Großmann, Swen and Biagioni, Paolo and Locatelli, Andrea and Angelis, Costantino De and Cerullo, Giulio and Osellame, Roberto and Hecht, Bert and Duò, Lamberto and Ciccacci, Franco and Finazzi, Marco},
  journal = {Nature Nanotech.},
  keywords = {antenna nano-optics plasmon resonance},
  month = {04},
  note = {<a href="https://arxiv.org/abs/1412.0698" style="font-style: normal;">&raquo; arxiv:1412.0698</a>},
  number = 5,
  pages = {412-417},
  title = {Mode matching in multiresonant plasmonic nanoantennas for enhanced second harmonic generation},
  volume = 10,
  year = 2015
}

Emission Engineering in Germanium Nanoresonators. Celebrano, Michele; Baselli, Milena; Bollani, Monica; Frigerio, Jacopo; Bahgat Shehata, Andrea; Della Frera, Adriano; Tosi, Alberto; Farina, Andrea; Pezzoli, Fabio; Osmond, Johann; Wu, Xiaofei; Hecht, Bert; Sordan, Roman; Chrastina, Daniel; Isella, Giovanni; Duò, Lamberto; Finazzi, Marco; Biagioni, Paolo in ACS Photonics (2015). 2(1) 53–59.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Shaping and spatiotemporal characterization of sub-10-fs pulses focused by a high-NA objective. Pawlowska, Monika; Goetz, Sebastian; Dreher, Christian; Wurdack, Matthias; Krauss, Enno; Razinskas, Gary; Geisler, Peter; Hecht, Bert; Brixner, Tobias in Opt. Express (2014). 22(25) 31496–31510.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Remote detection of single emitters via optical waveguides. Then, Patrick; Razinskas, Gary; Feichtner, Thorsten; Haas, Philippe; Wild, Andreas; Bellini, Nicola; Osellame, Roberto; Cerullo, Giulio; Hecht, Bert in Phys. Rev. A (2014). 89(5) 053801.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Coherent Control of Plasmon Propagation in a Nanocircuit. Rewitz, Christian; Razinskas, Gary; Geisler, Peter; Krauss, Enno; Goetz, Sebastian; Pawłowska, Monika; Hecht, Bert; Brixner, Tobias in Phys. Rev. Applied (2014). 1(1) 014007.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

@article{rewitz2014coherent,
  abstract = {The miniaturization of optical devices is a prerequisite for broadband data-processing technology to compete with cutting-edge nanoelectronic circuits. For these future nano-optical circuits, controlling the spatial and temporal evolution of surface plasmons, i.e., propagating optical near fields at metal-insulator interfaces, is a key feature. Here, we design, optimize, and fabricate a nanoscale directional coupler with one input and two output ports, a device that is an essential element of nano-optical circuits. The directional coupler is based on a two-wire transmission line supporting two plasmonic eigenmodes that can be selectively excited. By manipulating the input polarization of ultrashort pulses and pulse pairs and by characterizing the light emitted from both output ports, we demonstrate open-loop ultrafast spatial and spatiotemporal coherent control of plasmon propagation. Because of the intuitive and optimized design, which exploits a controlled near-field interference mechanism, varying the linear input polarization is enough to switch between both output ports of the nanoscale directional coupler. Since we exploit the interference of a finite spectrum of eigenmodes, our experiments represent a very intuitive classical analogue to quantum control in molecules.},
  author = {Rewitz, Christian and Razinskas, Gary and Geisler, Peter and Krauss, Enno and Goetz, Sebastian and Pawłowska, Monika and Hecht, Bert and Brixner, Tobias},
  journal = {Phys. Rev. Applied},
  keywords = {experiment nano-optics near-field plasmon},
  month = {02},
  number = 1,
  pages = {014007},
  title = {Coherent Control of Plasmon Propagation in a Nanocircuit},
  volume = 1,
  year = 2014
}

Multimode Plasmon Excitation and In Situ Analysis in Top-Down Fabricated Nanocircuits. Geisler, Peter; Razinskas, Gary; Krauss, Enno; Wu, Xiao-Fei; Rewitz, Christian; Tuchscherer, Philip; Goetz, Sebastian; Huang, Chen-Bin; Brixner, Tobias; Hecht, Bert in Phys. Rev. Lett. (2013). 111(18) 183901.

» arXiv:1304.1737

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Atomic-Scale Confinement of Resonant Optical Fields. Kern, Johannes; Großmann, Swen; Tarakina, Nadezda V.; Häckel, Tim; Emmerling, Monika; Kamp, Martin; Huang, Jer-Shing; Biagioni, Paolo; Prangsma, Jord C.; Hecht, Bert in Nano Lett. (2012). 12(11) 5504–5509.

» arXiv:1112.5008
press: » Atomic-scale confinement of resonant optical fields, coverimage on » pro-physik.de (german)

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

@article{kern2012atomicscale,
  abstract = {In the presence of matter, there is no fundamental limit preventing confinement of visible light even down to atomic scales. Achieving such confinement and the corresponding resonant intensity enhancement inevitably requires simultaneous control over atomic-scale details of material structures and over the optical modes that such structures support. By means of self-assembly we have obtained side-by-side aligned gold nanorod dimers with robust atomically defined gaps reaching below 0.5 nm. The existence of atomically confined light fields in these gaps is demonstrated by observing extreme Coulomb splitting of corresponding symmetric and antisymmetric dimer eigenmodes of more than 800 meV in white-light scattering experiments. Our results open new perspectives for atomically resolved spectroscopic imaging, deeply nonlinear optics, ultrasensing, cavity optomechanics, as well as for the realization of novel quantum-optical devices.},
  author = {Kern, Johannes and Großmann, Swen and Tarakina, Nadezda V. and Häckel, Tim and Emmerling, Monika and Kamp, Martin and Huang, Jer-Shing and Biagioni, Paolo and Prangsma, Jord C. and Hecht, Bert},
  journal = {Nano Lett.},
  keywords = {experiment nano-optics resonance},
  month = 11,
  note = {<i style="font-style: normal;"><a href="https://arxiv.org/abs/1112.5008">&raquo; arXiv:1112.5008</a> <br><b>press:</b> <a href="http://www.nanowerk.com/news2/newsid=26870.php">&raquo; Atomic-scale confinement of resonant optical fields</a>, coverimage on <a href="http://www.pro-physik.de/details/opnews/2686931/Lokalisiertes_Lichtfeld_im_Luftspalt.html">&raquo; pro-physik.de</a> (german)</i>},
  number = 11,
  pages = {5504-5509},
  title = {Atomic-Scale Confinement of Resonant Optical Fields},
  volume = 12,
  year = 2012
}

Evolutionary Optimization of Optical Antennas. Feichtner, Thorsten; Selig, Oleg; Kiunke, Markus; Hecht, Bert in Phys. Rev. Lett. (2012). 109(12) 127701.

» arXiv:1204.5422, » cover image

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Electrically Connected Resonant Optical Antennas. Prangsma, Jord C.; Kern, Johannes; Knapp, Alexander G.; Grossmann, Swen; Emmerling, Monika; Kamp, Martin; Hecht, Bert in Nano Lett. (2012). 12(8) 3915–3919.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Spectral-interference microscopy for characterization of functional plasmonic elements. Rewitz, Christian; Keitzl, Thomas; Tuchscherer, Philip; Goetz, Sebastian; Geisler, Peter; Razinskas, Gary; Hecht, Bert; Brixner, Tobias in Opt. Express (2012). 20(13) 14632–14647.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Dynamics of Four-Photon Photoluminescence in Gold Nanoantennas. Biagioni, Paolo; Brida, Daniele; Huang, Jer-Shing; Kern, Johannes; Duò, Lamberto; Hecht, Bert; Finazzi, Marco; Cerullo, Giulio in Nano Lett. (2012). 12(6) 2941–2947.

» arXiv:1109.5475 (2012)

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Circular Dichroism Probed by Two-Photon Fluorescence Microscopy in Enantiopure Chiral Polyfluorene Thin Films. Savoini, Matteo; Wu, Xiaofei; Celebrano, Michele; Ziegler, Johannes; Biagioni, Paolo; Meskers, Stefan C. J.; Duò, Lamberto; Hecht, Bert; Finazzi, Marco in J. Am. Chem. Soc. (2012). 134(13) 5832–5835.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Nanoantennas for visible and infrared radiation. Biagioni, Paolo; Huang, Jer-Shing; Hecht, Bert in Rep. Prog. Phys. (2012). 75(2) 024402.

» arXiv:1103.1568 (2012), » cover image

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Ultrafast Plasmon Propagation in Nanowires Characterized by Far-Field Spectral Interferometry. Rewitz, Christian; Keitzl, Thomas; Tuchscherer, Philip; Huang, Jer-Shing; Geisler, Peter; Razinskas, Gary; Hecht, Bert; Brixner, Tobias in Nano Lett. (2012). 12(1) 45–49.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Spontaneous Formation of Left- and Right-Handed Cholesterically Ordered Domains in an Enantiopure Chiral Polyfluorene Film. Savoini, Matteo; Biagioni, Paolo; Meskers, Stefan C. J.; Duò, Lamberto; Hecht, Bert; Finazzi, Marco in J. Phys. Chem. Lett. (2011). 2(12) 1359–1362.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Tailoring the interaction between matter and polarized light with plasmonic optical antennas. Biagioni, Paolo; Wu, X.; Savoini, Matteo; Ziegler, J.; Huang, Jer-Shing; Duò, Lamberto; Finazzi, Marco; Hecht, Bert (2011). (Vol. 7922) 79220C.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Atomically flat single-crystalline gold nanostructures for plasmonic nanocircuitry. Huang, Jer-Shing; Callegari, Victor; Geisler, Peter; Brüning, Christoph; Kern, Johannes; Prangsma, Jord C.; Wu, Xiaofei; Feichtner, Thorsten; Ziegler, Johannes; Weinmann, Pia; Kamp, Martin; Forchel, Alfred; Biagioni, Paolo; Sennhauser, Urs; Hecht, Bert in Nat Commun (2010). 1(1) 1–8.

» arXiv:1004.1961 (2010)

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

@article{huang2010atomically,
  abstract = {Deep subwavelength integration of high-definition plasmonic nanostructures is of key importance in the development of future optical nanocircuitry for high-speed communication, quantum computation and lab-on-a-chip applications. To date, the experimental realization of proposed extended plasmonic networks consisting of multiple functional elements remains challenging, mainly because of the multi-crystallinity of commonly used thermally evaporated gold layers. This can produce structural imperfections in individual circuit elements that drastically reduce the yield of functional integrated nanocircuits. In this paper we demonstrate the use of large ({\textgreater}100 μm2) but thin ({\textless}80 nm) chemically grown single-crystalline gold flakes that, after immobilization, serve as an ideal basis for focused ion beam milling and other top-down nanofabrication techniques on any desired substrate. Using this methodology we obtain high-definition ultrasmooth gold nanostructures with superior optical properties and reproducible nano-sized features over micrometre-length scales. Our approach provides a possible solution to overcome the current fabrication bottleneck and realize high-definition plasmonic nanocircuitry.},
  author = {Huang, Jer-Shing and Callegari, Victor and Geisler, Peter and Brüning, Christoph and Kern, Johannes and Prangsma, Jord C. and Wu, Xiaofei and Feichtner, Thorsten and Ziegler, Johannes and Weinmann, Pia and Kamp, Martin and Forchel, Alfred and Biagioni, Paolo and Sennhauser, Urs and Hecht, Bert},
  journal = {Nat Commun},
  keywords = {experiment flake-growth gold nano-optics plasmon},
  month = 12,
  note = {<a href="https://arxiv.org/abs/1004.1961" style="font-style: normal;">&raquo; arXiv:1004.1961 (2010)</a>},
  number = 1,
  pages = {1-8},
  title = {Atomically flat single-crystalline gold nanostructures for plasmonic nanocircuitry},
  volume = 1,
  year = 2010
}

Fast Quantitative Single-Molecule Detection at Ultralow Concentrations. Haas, Philippe; Then, Patrick; Wild, Andreas; Grange, Wilfried; Zorman, Sylvain; Hegner, Martin; Calame, Michel; Aebi, Ueli; Flammer, Josef; Hecht, Bert in Anal. Chem. (2010). 82(14) 6299–6302.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Mode Imaging and Selection in Strongly Coupled Nanoantennas. Huang, Jer-Shing; Kern, Johannes; Geisler, Peter; Weinmann, Pia; Kamp, Martin; Forchel, Alfred; Biagioni, Paolo; Hecht, Bert in Nano Lett. (2010). 10(6) 2105–2110.

» arXiv:1002.3887v1

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Subwavelength broadband splitters and switches for femtosecond plasmonic signals. Reiserer, Andreas A.; Huang, Jer-Shing; Hecht, Bert; Brixner, Tobias in Opt. Express (2010). 18(11) 11810–11820.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Near-field polarization shaping by a near-resonant plasmonic cross antenna. Biagioni, Paolo; Savoini, Matteo; Huang, Jer-Shing; Duò, Lamberto; Finazzi, Marco; Hecht, Bert in Phys. Rev. B (2009). 80(15) 153409.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Dependence of the two-photon photoluminescence yield of gold nanostructures on the laser pulse duration. Biagioni, Paolo; Celebrano, Michele; Savoini, Matteo; Grancini, Giulia; Brida, Daniele; Mátéfi-Tempfli, Stefan; Mátéfi-Tempfli, M.; Duò, Lamberto; Hecht, Bert; Cerullo, Giulio; Finazzi, Marco in Phys. Rev. B (2009). 80(4) 045411.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Cross Resonant Optical Antenna. Biagioni, Paolo; Huang, Jer-Shing; Duò, Lamberto; Finazzi, Marco; Hecht, Bert in Phys. Rev. Lett. (2009). 102(25) 256801.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Deterministic spatiotemporal control of optical fields in nanoantennas and plasmonic circuits. Huang, Jer-Shing; Voronine, Dmitri V.; Tuchscherer, Philip; Brixner, Tobias; Hecht, Bert in Phys. Rev. B (2009). 79(19) 195441.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Impedance Matching and Emission Properties of Nanoantennas in an Optical Nanocircuit. Huang, Jer-Shing; Feichtner, Thorsten; Biagioni, Paolo; Hecht, Bert in Nano Lett. (2009). 9(5) 1897–1902.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Detection of Transient Events in the Presence of Background Noise. Grange, Wilfried; Haas, Philippe; Wild, Andreas; Lieb, Michael Andreas; Calame, Michel; Hegner, Martin; Hecht, Bert in J. Phys. Chem. B. (2008). 112(23) 7140–7144.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

A simple method for producing flattened atomic force microscopy tips. Biagioni, Paolo; Farahani, Javad N.; Mühlschlegel, Peter; Eisler, Hans-Jürgen; Pohl, Dieter W.; Hecht, Bert in Rev. Sci. Instrum. (2008). 79(1) 016103.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Bow-tie optical antenna probes for single-emitter scanning near-field optical microscopy. Farahani, Javad N.; Eisler, Hans-Jürgen; Pohl, Dieter W.; Pavius, Michaël; Flückiger, Philippe; Gasser, Philippe; Hecht, Bert in Nanotechnology (2007). 18(12) 125506.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Prospects of Resonant Optical Antennas for Nano-Analysis. Hecht, Bert; Mühlschlegel, Peter; Farahani, Javad N.; Eisler, Hans-Jürgen; Pohl, Dieter W.; Martin, Olivier J. F.; Biagioni, Paolo in CHIMIA (2006). 60(11) 765–769.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Absorption and fluorescence of single molecules. Butter, Jacqueline Y. P.; Hecht, Bert; Crenshaw, B. R.; Weder, Christoph in J. Chem. Phys. (2006). 125(15) 154710.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Fast determination of saturation intensity and maximum emission rate by single-emitter imaging. Butter, Jacqueline Y. P.; Hecht, Bert in Opt. Express (2006). 14(20) 9350–9357.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Single Hepatitis-B Virus Core Capsid Binding to Individual Nuclear Pore Complexes in HeLa Cells. Lill, Yoriko; Lill, Markus A.; Fahrenkrog, Birthe; Schwarz-Herion, Kyrill; Paulillo, Sara; Aebi, Ueli; Hecht, Bert in Biophys. J. (2006). 91(8) 3123–3130.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Resorcin[4]arene Cavitand-Based Molecular Switches. Azov, V. A.; Beeby, A.; Cacciarini, M.; Cheetham, A. G.; Diederich, F.; Frei, M.; Gimzewski, J. K.; Gramlich, V.; Hecht, Bert; Jaun, B.; Latychevskaia, T.; Lieb, A.; Lill, Y.; Marotti, F.; Schlegel, A.; Schlittler, R. R.; Skinner, P. J.; Seiler, P.; Yamakoshi, Y. in Adv. Funct. Mater. (2006). 16(2) 147–156.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

@article{azov2006resorcin4arene,
  abstract = {Resorcin[4]arene cavitands with four quinoxaline bridges are a family of macrocycles that adopt, at elevated temperature, a contracted, vase-type conformation, capable of guest inclusion, whereas at low temperature they switch to an expanded, kite-type conformation with a large flat surface. The present investigations lay the foundation for the use of such dynamic cavitands as miniaturized mechanical grippers for supramolecular construction at the single-molecule level. New vase–kite switching modes, stimulated by pH changes or stoichiometric metal-ion complexation, have been discovered and monitored by 1H NMR and optical absorption spectroscopy. The solid-state geometries of the two states have been revealed by X-ray crystallography, and the kinetics and thermodynamics of the switching processes in solution as well as their solvent dependency has been investigated in great detail. Monolayers of the cavitand in the vase form have been studied by scanning tunneling microscopy at molecular resolution; conformational switching is also observed in Langmuir monolayers at the air/water interface. Synthetic protocols have been developed for preparation of partially and asymmetrically bridged resorcin[4]arene cavitands, which are also shown to undergo conformational switching. These synthetic advances pave the way to new, dynamic molecular receptors for steroids, tetrathiofulvalene-bridged grippers with the potential to undergo electrochemically induced conformational switching, and systems with greatly extended, rigid cavity walls functionalized at the termini by dipyrrometheneboron difluoride dyes. The latter cavitands are shown by fluorescence resonance energy transfer to undergo geometrically precisely defined motions between a contracted (≈ 7 Å linear extension) and a strongly expanded (≈ 7 nm linear extension) state.},
  author = {Azov, V. A. and Beeby, A. and Cacciarini, M. and Cheetham, A. G. and Diederich, F. and Frei, M. and Gimzewski, J. K. and Gramlich, V. and Hecht, Bert and Jaun, B. and Latychevskaia, T. and Lieb, A. and Lill, Y. and Marotti, F. and Schlegel, A. and Schlittler, R. R. and Skinner, P. J. and Seiler, P. and Yamakoshi, Y.},
  journal = {Adv. Funct. Mater.},
  keywords = {STM experiment nano-optics single-molecules},
  month = {09},
  number = 2,
  pages = {147-156},
  title = {Resorcin[4]arene Cavitand-Based Molecular Switches},
  volume = 16,
  year = 2006
}

%0 Journal Article
%1 azov2006resorcin4arene
%A Azov, V. A.
%A Beeby, A.
%A Cacciarini, M.
%A Cheetham, A. G.
%A Diederich, F.
%A Frei, M.
%A Gimzewski, J. K.
%A Gramlich, V.
%A Hecht, Bert
%A Jaun, B.
%A Latychevskaia, T.
%A Lieb, A.
%A Lill, Y.
%A Marotti, F.
%A Schlegel, A.
%A Schlittler, R. R.
%A Skinner, P. J.
%A Seiler, P.
%A Yamakoshi, Y.
%D 2006
%J Adv. Funct. Mater.
%N 2
%P 147-156
%R 10.1002/adfm.200500181
%T Resorcin[4]arene Cavitand-Based Molecular Switches
%V 16
%X Resorcin[4]arene cavitands with four quinoxaline bridges are a family of macrocycles that adopt, at elevated temperature, a contracted, vase-type conformation, capable of guest inclusion, whereas at low temperature they switch to an expanded, kite-type conformation with a large flat surface. The present investigations lay the foundation for the use of such dynamic cavitands as miniaturized mechanical grippers for supramolecular construction at the single-molecule level. New vase–kite switching modes, stimulated by pH changes or stoichiometric metal-ion complexation, have been discovered and monitored by 1H NMR and optical absorption spectroscopy. The solid-state geometries of the two states have been revealed by X-ray crystallography, and the kinetics and thermodynamics of the switching processes in solution as well as their solvent dependency has been investigated in great detail. Monolayers of the cavitand in the vase form have been studied by scanning tunneling microscopy at molecular resolution; conformational switching is also observed in Langmuir monolayers at the air/water interface. Synthetic protocols have been developed for preparation of partially and asymmetrically bridged resorcin[4]arene cavitands, which are also shown to undergo conformational switching. These synthetic advances pave the way to new, dynamic molecular receptors for steroids, tetrathiofulvalene-bridged grippers with the potential to undergo electrochemically induced conformational switching, and systems with greatly extended, rigid cavity walls functionalized at the termini by dipyrrometheneboron difluoride dyes. The latter cavitands are shown by fluorescence resonance energy transfer to undergo geometrically precisely defined motions between a contracted (≈ 7 Å linear extension) and a strongly expanded (≈ 7 nm linear extension) state.

Stark-shift microscopy of single emitters. Karotke, S.; Lieb, A.; Hecht, Bert in Appl. Phys. Lett. (2006). 89(2) 023106.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Aperture scanning near-field optical microscopy and spectroscopy of single terrylene molecules at 1.8 K. Butter, Jacqueline Y. P.; Hecht, Bert in Nanotechnology (2006). 17(6) 1547–1550.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Single-Molecule Spectroscopy of Uniaxially Oriented Terrylene in Polyethylene. Butter, Jacqueline Y. P.; Crenshaw, Brent R.; Weder, Christoph; Hecht, Bert in ChemPhysChem (2006). 7(1) 261–265.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Glue-free tuning fork shear-force microscope. Mühlschlegel, Peter; Toquant, Julien; Pohl, Dieter W.; Hecht, Bert in Rev. Sci. Instrum. (2006). 77(1) 016105.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Excitation and superfocusing of surface plasmon polaritons on a silver-coated optical fiber tip. Janunts, Norik A.; Baghdasaryan, K. S.; Nerkararyan, Khachatur V.; Hecht, Bert in Optics Commun. (2005). 253(1) 118–124.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Kinetics of the Initial Steps of G Protein-Coupled Receptor-Mediated Cellular Signaling Revealed by Single-Molecule Imaging. Lill, Yoriko; Martinez, Karen L.; Lill, Markus A.; Meyer, Bruno H.; Vogel, Horst; Hecht, Bert in ChemPhysChem (2005). 6(8) 1633–1640.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Optische Antennen. Hecht, Bert; Eisler, Hans-Jürgen; Pohl, Dieter W.; Martin, Olivier J. F. in Physik in unserer Zeit (2005). 36(5) 209–210.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Single Quantum Dot Coupled to a Scanning Optical Antenna: A Tunable Superemitter. Farahani, Javad N.; Pohl, Dieter W.; Eisler, Hans-Jürgen; Hecht, Bert in Phys. Rev. Lett. (2005). 95(1) 017402.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Resonant Optical Antennas. Muehlschlegel, Peter; Eisler, Hans-Jürgen; Martin, Olivier J. F.; Hecht, Bert; Pohl, Dieter W. in Science (2005). 308(5728) 1607–1609.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Nano-optics with single quantum systems. Richards, David; Zayats, Anatoly; Hecht, Bert in Phil. Trans. R. Soc. Lond. A (2004). 362(1817) 881–899.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Single dye molecules in an oxygen-depleted environment as photostable organic triggered single-photon sources. Lill, Yoriko; Hecht, Bert in Appl. Phys. Lett. (2004). 84(10) 1665–1667.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Synthesis and Conformational Switching of Partially and Differentially Bridged Resorcin[4]arenes Bearing Fluorescent Dye Labels. Azov, Vladimir A.; Diederich, François; Lill, Yoriko; Hecht, Bert in Helv. Chim. Acta (2003). 86(6) 2149–2155.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Three-dimensional optical polarization tomography of single molecules. Prummer, Michael; Sick, Beate; Hecht, Bert; Wild, Urs P. in J. Chem. Phys. (2003). 118(21) 9824–9829.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Single-molecule near-field optical energy transfer microscopy with dielectric tips. Trabesinger, Werner; Kramer, Andrei; Kreiter, Maximilian; Hecht, Bert; Wild, Urs P. in J. Microscopy (2003). 209(3) 249–253.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Fabricating Arrays of Single Protein Molecules on Glass Using Microcontact Printing. Renault, J.-P.; Bernard, A.; Bietsch, A.; Michel, B.; Bosshard, H. R.; Delamarche, E.; Kreiter, Maximilian; Hecht, Bert; Wild, Urs P. in J. Phys. Chem. B. (2003). 107(3) 703–711.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

@article{renault2003fabricating,
  abstract = {Microcontact printing biomolecules from elastomeric micropatterned stamps onto surfaces is a versatile method to prepare surfaces for diagnostic applications. We show how to create patterns of proteins having a lengthscale lower than 100 nm using high-resolution microcontact printing. The elastomeric stamps used have meshes composed of 100- and 40-nm-wide lines, arrays of 100 × 400 nm2 features, and arrays of 100-nm-wide posts. The spherical geometry of the posts on the stamps contributes to reduce the printed areas below the effective size of the molded features. Proteins adsorb onto the hydrophobic surface of the stamp during the inking step, and by varying the concentration of the protein solutions, it is possible to adsorb a single or a few protein molecules, such as antibodies (fluorescently labeled) or green fluorescence proteins, on each of the elements forming the high-resolution pattern of the stamp. The transfer of the proteins from the stamp to a hydrophilic glass surface occurs during the printing step. Characterization of the printed patterns using atomic force microscopy and fluorescence confocal microscopy reveals sites unoccupied or occupied by one or more protein molecules that are located within 50 nm of the expected printed locations. The placement of a small number of protein molecules on a surface at precise locations is the key to localizing and identifying single proteins and might constitute a method of choice to study single protein molecules on surfaces.},
  author = {Renault, J.-P. and Bernard, A. and Bietsch, A. and Michel, B. and Bosshard, H. R. and Delamarche, E. and Kreiter, Maximilian and Hecht, Bert and Wild, Urs P.},
  journal = {J. Phys. Chem. B.},
  keywords = {AFM experiment nano-optics single-molecules},
  month = {01},
  number = 3,
  pages = {703-711},
  title = {Fabricating Arrays of Single Protein Molecules on Glass Using Microcontact Printing},
  volume = 107,
  year = 2003
}

Orientation dependence of fluorescence lifetimes near an interface. Kreiter, Maximilian; Prummer, Michael; Hecht, Bert; Wild, Urs P. in J. Chem. Phys. (2002). 117(20) 9430–9433.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Single-molecule near-field optical energy transfer microscopy. Trabesinger, W.; Kramer, Andrei; Kreiter, Maximilian; Hecht, Bert; Wild, Urs P. in Appl. Phys. Lett. (2002). 81(11) 2118–2120.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

A cryogenic scanning near-field optical microscope with shear-force gapwidth control. Kramer, Andrei; Segura, Jean-Manuel; Hunkeler, A.; Renn, Alois; Hecht, Bert in Rev. Sci. Instrum. (2002). 73(8) 2937–2941.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Continuous real-time measurement of fluorescence lifetimes. Trabesinger, Werner; Hübner, Christian G.; Hecht, Bert; Wild, Urs P. in Rev. Sci. Instrum. (2002). 73(8) 3122–3124.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Optical near-field enhancement at a metal tip probed by a single fluorophore. Kramer, Andrei; Trabesinger, Werner; Hecht, Bert; Wild, Urs P. in Appl. Phys. Lett. (2002). 80(9) 1652–1654.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Photon statistics in single-molecule fluorescence at room temperature. Fleury, Ludovic; Segura, Jean-Manuel; Zumofen, Gert; Hecht, Bert; Wild, Urs P. in J. of Luminescence (2001). 94-95 805–809.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Probing confined fields with single molecules and vice versa. Sick, Beate; Hecht, Bert; Wild, Urs P.; Novotny, Lukas in J. Microscopy (2001). 202(2) 365–373.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Molecular rearrangements observed by single-molecule microscopy. Trabesinger, Werner; Renn, Alois; Hecht, Bert; Wild, Urs P.; Montali, Andrea T.; Smith, Paul F.; Weder, Christoph in Synthetic Metals (2001). 124(1) 113–115.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Tip-induced spectral dynamics of single molecules. Segura, Jean-Manuel; Zumofen, Gert; Renn, Alois; Hecht, Bert; Wild, Urs P. in Chem. Phys. Lett. (2001). 340(1) 77–82.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]

Statistical Analysis of Single-Molecule Colocalization Assays. Trabesinger, Werner; Hecht, Bert; Wild, Urs P.; Schütz, Gerhard J.; Schindler, H.; Schmidt, Th. in Anal. Chem. (2001). 73(6) 1100–1105.

[ Abstract ] [ BibTeX ] [ EndNote ] [ DOI ]