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HL: Fachverband Halbleiterphysik
HL 33: Poster Session III
HL 33.18: Poster
Mittwoch, 14. März 2018, 17:30–19:30, Poster F
Single Quantum Dot with Microlens and 3D-Printed Microobjective as Integrated Bright Single-Photon Source — •Jan Hausen1, Sarah Fischbach1, Timo Gissibl2, Simon Ristok2, Ksenia Weber2, Simon Thiele3, Tobias Heindel1, Sven Rodt1, Alois Herkommer3, Harald Giessen2, and Stephan Reitzenstein1 — 1Institute of Solid State Physics, Technische Universität Berlin, Berlin, Germany — 24th Physics Institute and Research Center SCoPE, Stuttgart, Germany — 3Institute for Applied Optics and Research Center SCoPE, Stuttgart, Germany
In recent years, semiconductor quantum dots (QD) have proven to work as close to ideal single-photon sources. In order to apply such sources in future quantum communication systems, it will be crucial to further increase the photon-extraction efficiency. Here we report on deterministically fabricated QD-microlenses combined with 3D printed microobjectives (MO). Monolithic microlenses were fabricated in a deterministic way by in-situ electron beam lithography allowing for spacial and spectral pre-selection of suitable QDs. Two-photon 3D direct laser writing enabled the realization of multilens MOs precisely aligned to the brightest microlens structures. A micro photoluminescence characterisation of the resulting combination shows an enhancement of the photon-extraction efficiency by a factor of two. The device also exhibits a high suppression of multiphoton events with g(2)(τ = 0)<0.02.