Osnabrück 2002 – wissenschaftliches Programm

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Q: Quantenoptik

Q 431: Poster: Quanteneffekte

Q 431.1: Poster

Donnerstag, 7. März 2002, 16:30–18:30, Schloss

Photoluminescence of single quantum emitters — •Thomas Aichele and Oliver Benson — Humboldt-Universität zu Berlin, Institut für Physik, Hausvogteiplatz 5-7, 10117 Berlin, Germany

In the last years there has been an increasing interest in the realization of single photon light sources [1]. First experiments used fluorescing single quantum emitters, such as quantum dots, nanocrystals and nitrogen-vacancy colour centres in diamond, which reveal non-classical effects like discrete spectra and photon-antibunching.

Our experiment aims at increasing the light extraction efficiency from single photon light sources and at manipulating single quantum emitters with high spatial resolution. In a first step we started an experiment where we collect photoluminescence light from various single quantum emitters. The setup is a scanning confocal microscope, where the samples are mounted in a liquid helium flow-cryostat. The temperature can be changed from 4 K to room temperature. The fluorescence light is collected and sent either into a spectrometer or to avalanche photo diodes, forming a Hanbury Brown-Twiss interferometer. We will present first results, including fluorescence spectra and time correlation measurements. Furthermore we will present a future experiment, where single quantum emitters can be observed using a scanning near-field optical microscope in a liquid helium flow-cryostat.

[1] P. Michler and C. Becher, Phys. Bl. 9/2001, p. 55, and references therein