Dresden 2026 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 20: Poster I
HL 20.27: Poster
Dienstag, 10. März 2026, 18:00–20:00, P1
Active Fabri-Perot interferometer cavity stabilization for high-resolution spectroscopy of low-light single-photon emitters — •F. Stechemesser1, F. Schaumburg1, C. Dietrich2, H. Mannel1, A. Rodriguez2, J. König2, C. Steiner3, P. Pesch3, A. Lorke1, G. Prinz1, M. Geller1, and A. Kurzmann2 — 1Faculty of Physics, University of Duisburg-Essen and CENIDE, Germany — 2Physikalisches Institut Fachgruppe Physik, Universität zu Köln, Germany — 3Fachgruppe Physik, RWTH Aachen, Germany
Single-photon emission from solid-state quantum emitters, such as quantum dots and defects in 2D materials, with narrow linewidths is one of the key ingredients for future applications in quantum information processing. In photoluminescence spectroscopy, the linewidths of such emitters can be determined using a grating spectrometer. However, in resonance fluorescence and at low laser excitation intensity, such spectrometers reach their limits regarding resolution and optical sensitivity. We introduce an actively stabilized, narrow-linewidth (free spectral range of 30 GHz) Fabry-Perot interferometer (FPI) that is stabilized using the light from a frequency-tunable diode laser. The quantum emitter photons are sent through the FPI, which is scanned across the emitter resonances. This approach enables measurements on a single photon detector (APD) with extended integration times. The single photon sensitivity of an APD can then be used to resolve low-intensity optical resonances of the different quantum emitters with a resolution down to 60 MHz. We show first results of single photon emission from InAs quantum dots and defects in WSe2 monolayers.
Keywords: Hetero-structure; 2D materials; WSe2; Fabry-Perot interferometer; Single-photon emitter