SKM 2021 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 13: Poster Session III

HL 13.8: Poster

Tuesday, September 28, 2021, 13:30–16:30, P

Hyperspectral imaging for deterministic quantum dot microcavities — •Quirin Buchinger¹, Magdalena Moczała-Dusanowska¹, Łukasz Dusanowski², Tobias Huber¹, and Sven Höfling¹ — ¹Technische Physik, Universität Würzburg, 97074 Würzburg, Germany — ²Department of Electrical and Computer Engineering, Princeton University, 08544 Princeton (NJ), USA

For many photonic quantum communication schemes, including quantum networks, indistinguishable single photons or entangled photon pairs are required. Semiconductor quantum dots (QDs) in microcavities are a promising source due to their high quantum efficiency [1], photon indistinguishability [2], and outcoupling efficiency. As a disadvantage these self-assembled QDs are randomly distributed over the sample and have inhomogeneosly distributed emission wavelengths.

Here, we present an approach using hyperspectral imaging to locate self-assembled QDs and to integrate them deterministically into microcavities. We image InGaAs-QDs in a GaAs-Membrane and perform subsequent processing of Circular-Bragg-grating cavities. We show possibilities and solutions to improve the spatial accuracy through marker design, data acquisition and image processing. Further, we discuss the combination of imaging and acquisition of single spectrums at thereby identified QDs to reduce the needed time compared to hyperspectral imaging without a trade-off on spectral and spatial information.

[1]Michler et al. Science, 290, 2282-2285 (2020)

[2]Santorio et al. Nature, 419, 594-597 (2002)