SAMOP 2023 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 59: Poster IV

Q 59.67: Poster

Thursday, March 9, 2023, 16:30–19:00, Empore Lichthof

An Automated Setup for Single-Photon Fluorescence Microscopy Measurements — •Raphael V. Wichary, Matthias Nuß, and Tobias Brixner — Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany

We present a setup with automated beampath selection to perform ultrafast nonlinear fluorescence microscopy at the single-photon level in a diffraction-limited focus. Pneumatically movable mirrors built into an optical cage system enable quick and reliable changes in the beam path with accurate position reproducibility. The setup includes motorized waveplates for full excitation polarization control with a laser spectrum ranging from 675 nm to 810 nm. Incorporation of a TWINS interferometer [1] enables spectrally resolved measurements of single quantum emitters. Detection is handled either by avalanche photodiodes or by a superconducting nanowire single-photon detector (SNSPD). A Hanbury-Brown–Twiss Interferometer enables verification of anti-bunched photon statistics.

[1] D. Brida et al., Opt. Lett., 37, 3027-3029 (2012)