Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 44: Optical Properties I

HL 44.9: Vortrag

Mittwoch, 9. März 2016, 12:15–12:30, H10

Circular Bragg grating cavity design for efficient sources of single photons fabricated within a deterministic technology platform — •Anna Musiał^1,2, Benjamin Wohlfeil³, Sven Burger³, Tobias Heuser¹, Arsenty Kaganskiy¹, Esra Yarar Tausher¹, Ronny Schmidt¹, Sven Rodt¹, and Stephan Reitzenstein¹ — ¹Institut für Festkörperphysik, Technische Universität Berlin, Germany — ²Faculty of Fundamental Problems of Technology, Wrocław University of Technology, Poland — ³Computational Nano Optics, Zuse Institut Berlin, Germany

Growing interest in quantum information processing and secure communication requires realization of efficient single-photon sources (SPS). Reliable implementation of advanced quantum protocols makes deterministic fabrication technologies desirable. A further key requirement is maximizing the extraction efficiency of emission from QDs acting as single-photon emitters. To tackle these issues we propose to deterministically integrate single QDs into circular Bragg grating cavities (CBGC). We present results based on the modelling of GaAs/air CBGCs using a finite element method which allows us to optimize the cavity design parameters for maximum extraction efficiency. For this purpose, a detailed knowledge of the influence of cavity geometry on the electro-magnetic field distribution, mode energy, cavity quality factor and optimal position of the QD in the cavity is indispensable. Optimized design parameters are used to realize CBGCs that include single In(Ga)As QDs by combining cathodoluminescence spectroscopy and in-situ electron-beam lithography.