Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 24: Poster Session II

HL 24.19: Poster

Tuesday, March 13, 2018, 18:30–20:30, Poster F

Deterministic fabrication of circular Bragg gratings around pre-selected quantum dots for high performance light sources — •Sascha Kolatschek, Stefan Hepp, Marc Sartison, Simone Luca Portalupi, Michael Jetter, and Peter Michler — Institut für Halbleiteroptik und Funktionelle Grenzflächen (IHFG), Center for Integrated Quantum Science and Technology (IQST) and SCoPE, University of Stuttgart, Allmandring 3, 70569 Stuttgart.

Highly efficient single photon sources are a crucial component for quantum information processes. Semiconductor quantum dots (QDs) have been proven to be excellent candidates due to their outstanding optical properties. Among different stratergies to increase light extraction, the use of photonic nanostructures enables, together with increased brightness, also an improved indistinguishability and reduced lifetime using linear optics and cavity quantum electrodynamic effects. Here we show Purcell enhancement for non-deterministically positioned circular Bragg grating cavities and, together with a novel deterministic fabrication method for the integration of preselected QDs into the respective cavities, count rate increases up to a factor of 60 with respect to measurements before cavity fabrication.