Three dimensionally confined light in microdisk can be tuned to the energy of quantum dot excitons. We have realized high quality whispering gallery modes (Q>10000) in resonance with electronic excitations of single quantum dots. Topics of interest are related to:

• Weak/strong exciton-photon coupling
• Lasing of quantum dots

Left part: Cross section scheme of a II-VI based heterostructure with embedded CdSe quantum dots and an optical gladding. Centre part: Electron microscope image of a microdisk fabricated by electron beam lithography and dry etching. Right part: Emission spectra of a II-VI microdisk with quantum dots (QD). Right part: The QD luminescence forms a broad peak centred at about 2.4 eV. Narrow lines are whispering gallery modes.