Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 9: Quantum Dots: Preparation and Characterization

HL 9.9: Vortrag

Montag, 20. März 2017, 12:00–12:15, POT 112

Efficient deterministic single-photon sources based on quantum-dots in suspended circular Bragg grating cavities — •Tobias Heuser, Arsenty Kaganskiy, Esra B. Yarar Tauscher, Ronny Schmidt, Anna Musial, Sven Rodt, and Stephan Reitzenstein — Institut für Festkörperphysik, Technische Universität Berlin, D-10623 Berlin, Germany

Applications in the field of quantum communication will benefit strongly from deterministic single-photon sources (SPSs) based on single semiconductor quantum dots (QDs). Such non-classical light sources feature close to ideal single-photon emission as well as photon-indistinguishability. However, maximizing the photon extraction efficiency of these sources remains an important issue.

Here, we report on the implementation of a highly efficient semiconductor QD-based SPS using a circular Bragg grating which is patterned into a suspended membrane. The high refractive index contrast at the grating leads to in-plane light confinement as well as vertically asymmetric out-of-plane scattering. Maximizing the photon extraction efficiency by finite element simulations of the device geometry yields values up to even 80%. To implement this approach with a high device yield, we apply deterministic high-resolution in-situ electron beam lithography [1] at cryogenic temperatures. In this way, specific QDs can be pre-selected according to their position and emission energy to ensure spatial and spectral matching for optimal extraction efficiency.

References

[1] M. Gschrey, Appl. Phys. Lett. ,vol. 102, p. 251113, 2013