Erlangen 2022 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 41: Nano-Optics
Q 41.16: Poster
Wednesday, March 16, 2022, 16:30–18:30, P
Broadband home-built confocal microscope for the characterization of quantum emitters — •Kevin Thommes1,2, Katja Höflich1,2, Arno Rauschenbeutel2, and Sofia Pazzagli2 — 1Ferdinand-Braun-Institut gGmbH - Leibniz-Institut für Höchstfrequenztechnik — 2Humboldt-Universität zu Berlin - Institut für Physik
In the field of future quantum technologies, single-photon emitters are of fundamental importance. However, it is still unclear which of the many possible solid-state-based quantum emitters, such as molecules or defects in crystals, will be most suitable for specific future applications. Therefore, we have established a multi-color setup for confocal epi-fluorescence microscopy, which allows different wavelengths in excitation and detection and thus gives access to different solid-state systems. Combined with a configurable beam path in excitation, we can acquire white light and photoluminescence images as well as spectra with an electron multiplier CCD camera and spectrometer over a wide spectral range. Controlling the excitation polarization and the choice of detection polarization gives us additional information about the absorption and emission characteristics and, if necessary, the orientation of the dipolar emitter. To accurately determine the position of the emitters on the sample with respect to a current configuration, we can perform confocal scans. Finally, photon emission statistics can be measured determining the second-order autocorrelation function in a Hanbury-Brown-Twiss setup. We will show example measurements for defect centers in hexagonal boron nitride, which are characterized by high brightness and robustness of quantum emission.