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GaAs Quantum Dot in a Parabolic Microcavity Tuned to 87Rb D1

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journal contribution
posted on 24.12.2019, 21:06 by Thomas Lettner, Katharina D. Zeuner, Eva Schöll, Huiying Huang, Selim Scharmer, Saimon Filipe Covre da Silva, Samuel Gyger, Lucas Schweickert, Armando Rastelli, Klaus D. Jöns, Val Zwiller
We develop a structure to efficiently extract photons emitted by a GaAs quantum dot tuned to rubidium. For this, we employ a broadband microcavity with a curved gold backside mirror that we fabricate by a combination of photoresist reflow, dry reactive ion etching in an inductively coupled plasma, and selective wet chemical etching. Precise reflow and etching control allows us to achieve a parabolic backside mirror with a short focal distance of 265 nm. The fabricated structures yield a predicted (measured) collection efficiency of 63% (12%), an improvement by more than 1 order of magnitude compared to unprocessed samples. We then integrate our quantum dot parabolic microcavities onto a piezoelectric substrate capable of inducing a large in-plane biaxial strain. With this approach, we tune the emission wavelength by 0.5 nm/kV, in a dynamic, reversible, and linear way, to the rubidium D1 line (795 nm).