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HL: Fachverband Halbleiterphysik

HL 25: Quantum dots: Microcavities and microlaser

HL 25.4: Vortrag

Dienstag, 17. März 2015, 10:15–10:30, EW 203

Boosting the photon outcoupling efficiency in deterministic all-epitaxial quantum dot microcavities — •Peter Schnauber, Manuel Gschrey, Arsenty Kaganskiy, Jan-Hindrik Schulze, Alexander Thoma, Sven Rodt, André Strittmatter, and Stephan Reitzenstein — Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin

Single semiconductor quantum dot (QD) based non-classical light sources have high potential to path the way for future quantum communication networks. In realistic scenarios key requirements are a high photon outcoupling efficiency, strong suppression of multiphoton emission events and a high degree of photon indistinguishability. These strict requirements can be met by integrating single QDs deterministically into microcavities showing acceleration of spontaneous emission and directional outcoupling of light. In this work we present numerical optimization of all-epitaxial QD-microcavities for which a Gaussian shaped photonic defect in the central cavity layer ensures 3D light confinement. Maximizing the outcoupling efficiency η_ext of spectrally resonant QDs placed in the center of the photonic defect yields η_ext as high as 81% and a Purcell-factor of 9 for such microcavities. The optimized layout is implemented by means of in-situ electron-beam lithography [1] which allows us to achieve spatial and spectral resonance of single pre-registered QDs and the confined mode of all-epitaxial microcavities. Preliminary experimental results show the feasibility and the great potential of this approach.

[1] M. Gschrey et al., APL 102 (25), 251113 (2013)