Experimental Physics V

Nano-Optics and Biophotonics

Research topics


Interfacing electrons and photons at the nanometerscale may lead to ultrasmall light-emitting devices for computer screens or to ultrafast on-chip optical communication. We have developed electrically connected optical nanoantennas that serve as a platform for series of experiments in which electrons and photons interact strongly to produced new physical effects.

Further reading:
Electrically-driven optical antennas, J. Kern, R. Kullock, J.P. Prangsma, M. Emmerling, M. Kamp & B. Hecht Nature Photonics 9, 582 -586 (2015), arxiv:1502.04935

Electrically connected resonant optical antennas, J.C. Prangsma, J. Kern, A.G. Knapp, M. Kamp & B. Hecht Nano Letters 12, 3915 (2012)


"Mode Selector v10"

Controlling the flow of optical frequency excitations at the nanometerscale has great potential for diverse applications such as integrated optical communication and on-chip optical sensing. We are able to selectively excited and control the propagation of different well-defined modes on two-wire transmission lines. Such modal control can be used to obtain routing of optical pulses according to criteria such as polarization.

Further reading:
Coherent control of plasmon propagation in a nanocircuit, C. Rewitz, G. Razinskas, P. Geisler, E. Krauss, S. Goetz, M. Pawlowska, B. Hecht & T. Brixner
Phys. Rev. Applied 1, 014007 (2014)

Multimode plasmon excitation and in-situ analysis in top-down fabricated plasmonic nanocircuits, P. Geisler, G. Razinskas, E. Krauss, X. Wu, C. Rewitz, P. Tuchscherer, S. Goetz, C. Huang, T. Brixner & B. Hecht
Phys. Rev. Lett. 111, 183901 (2013), arXiv:1304.1737


"scanning 25 4k less reflection 3"

Strong coupling of a single quantum system to an optical resonator is a hallmark of quantum optics. It is characterized by the repeated coherent exchange of a single excitation between the emitter and the resonator. We study strong coupling of single emiters to plasmonic nanoresonantors at room temperature. We use AFM technology to position emitters within the ultrasmall subwavelength mode volumes of broadband plasmonic nanoresonantors. The goal is to achieve deterministic photon-atom interaction for quantum communication as well as the development of novel quantum optical imaging modalities.


"Flake Atom"

We rely on our ability to fabricate high-end single-crystalline gold nanostructures based on large, but very thin chemically grown single-crystal gold flakes. Using top-down nanostructuring methods, such as focussed ion-beam milling, we strive to obtain highest quality gold nanostructures with close to atomic precision.

Further reading:

Single-crystalline gold microplates grown on substrates by solution-phase synthesis, X. Wu, R. Kullock, E. Krauss & B. Hecht
Cryst. Res. Technol. 50, 595 (2015)

Silica-gold bilayer-based transfer of focused ion beam-fabricated nanostructures, X. Wu, P. Geisler, E. Krauss, R. Kullock & B. Hecht
Nanoscale 7, 16427 (2015)

"Sketch of a snowflake"

Our mission is to obtain fundamental control over light-matter interaction by controling the flow of photons at the nanometer scale down to the size of single atoms, molecules, and quantum dots. We use optical nanoantennas and related plasmonic nanostructures as enabling devices.


Lehrstuhl für Experimentelle Physik (Biophysik)
Am Hubland
97074 Würzburg

Phone: +49 931 31-85867
Fax: +49 931 31-85851

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