Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HL: Fachverband Halbleiterphysik

HL 26: Poster II

HL 26.39: Poster

Mittwoch, 11. März 2026, 09:30–11:30, P1

Revisiting Cross-Polarized Resonant Excitation: Spin-Orbit Interaction in Confocal Dark-Field Microscopy — •Anton Lögl, Wenze Lan, and Bernhard Urbaszek — Institute for Condensed Matter Physics, Technische Universität Darmstadt, 64289 Darmstadt, Germany

Resonant excitation is a key experiment for accessing and probing the optical properties of semiconductor quantum emitters. The typical epifluorescence geometry of the cryostat environment presents an experimental challenge: separating the much weaker emission of the sample from the much stronger excitation, typically addressed using a cross-polarization scheme [1]. It is well known that confocal microscopy in combination with a dark-field technique can surpass the intrinsic extinction limit of commercial polarizers [1, 2]. In this work, we investigate the spin-orbit interaction of light observed when a polarized Gaussian beam is reflected from a mirror surface within such a microscope arrangement. We revisit the model from [2] and demonstrate that slight modifications allow us to phenomenologically model all of our results within the linear and circular polarization basis. Our results pave the way for improved characterization and optimization of optical setups used to measure the optical properties of various quantum emitters. Simultaneously, our results highlight how poorly understood the physical principles of one of the most common characterization techniques in resonant spectroscopy are.

[1] A. V. Kuhlmann, et al. Rev. Sci. Instrum. 84, 073905 (2013)

[2] Benelajla, M. et al. Phys. Rev. X 11, 021007 (2021)

Keywords: Resonance Fluorescence; Confocal Microscopy; Polarization; Spin-Orbit Interaction of Light; Extinction Ratio