Dresden 2020 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 26: Focus Session: Integrated Quantum Photonics I

HL 26.4: Talk

Tuesday, March 17, 2020, 11:00–11:15, POT 51

Optimized designs for telecom-wavelength quantum light sources based on hybrid circular Bragg gratings — •Lucas Rickert, Johannes Schall, Timm Kupko, Sven Rodt, Stephan Reitzenstein, and Tobias Heindel — Institut für Festkörperphysik, Technische Universität Berlin, 10623 Berlin, Germany

We present finite-element simulations of optimized designs for hybrid circular Bragg grating devices operating at telecom O-band wavelengths [1]. The designs show Purcell factors up to 30 and photon extraction efficiencies exceeding 95%. We discuss how the optical properties are affected by the variation of structural parameters and investigate the designs’ performance if possible fabrication-related structural imperfections are introduced, including imperfect side-wall etching and non-ideal positioning of the emitter inside the device. For the latter, we show that the devices are robust against emitter displacements well within reported deterministic fabrication uncertainties for structures with embedded semiconductor quantum dots. Additionally, we present simulations showing the CBG devices’ compatibility to optical single mode fibers and obtain up to 80% fiber coupling efficiency with off-the-shelf fibers. We further investigate on how to improve the fiber coupling to close to unity by the use of specialty fibers and address C-band compatible CBG designs.
[1] Rickert et al., Optics Express, arXiv.1908.08408, in press (2019)