Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 63: Poster: Quantum Dots and Optics

HL 63.7: Poster

Mittwoch, 22. März 2017, 15:00–19:00, P1A

Towards deterministic fabrication of circular Bragg gratings for enhanced quantum-dot based light sources — •Sascha Kolatschek, Stefan Hepp, Marc Sartison, Simone L. Portalupi, Michael Jetter, and Peter Michler — Institut für Halbleiteroptik und Funktionelle Grenzflächen, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, Universität Stuttgart, Allmandring 3, 70569 Stuttgart, Germany

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 a novel deterministic fabrication method for the integration of preselected QDs into a circular Bragg grating cavity. Besides their significant Purcell enhancement these cavities show due to the asymmetric design a more probable emission in the upside direction (i.e. upwards with respect to the substrate located underneath) with a highly directional far-field pattern.