SKM 2021 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 13: Poster Session III
HL 13.10: Poster
Tuesday, September 28, 2021, 13:30–16:30, P
Feedback-induced chaotic emission from a GaAs-QW high-contrast grating microcavity structure — •Aris Koulas-Simos1, Melanie Hoeschele1, Jiaqi Hu2, Hui Deng2,3, and Stephan Reitzenstein1 — 1Institut für Festkörperphysik, Technische Universität Berlin, 10623 Berlin, Germany — 2Applied Physics Program, University of Michigan, Ann Arbor, Michigan 48109, USA — 3Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
We investigate the optical and quantum optical properties of a high-contrast grating microcavity structure based on GaAs multiple quantum wells subject to optical feedback. Power-dependent microphotoluminescence (µPL) studies reveal the typical s-shaped form in the I/O curve with a pronounced kink signifying the lasing onset, accompanied by an abrupt linewidth narrowing. The effect of the optical feedback is visible in the shift of the threshold to lower excitation powers. Additional angle-resolved PL measurements show a condensation to lower k-states and spectrally narrower emission. In power-dependent photon-autocorrelation, enhanced bunching and revival peaks with a period equal to the round-trip time of the external cavity are pronounced, indicating chaotic emission as a result of the optical feedback [1]. This is again verified by calculating the photon-autocorrelation function g(2)(τ) through single-shot intensity trace measurements with a streak camera.
[1] F. Albert et al., Nat. Comm. 2, p. 1-5 (2011)