Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 3: Semiconductor lasers and Photonic crystals

HL 3.8: Vortrag

Montag, 1. April 2019, 11:30–11:45, H33

Bragg grating cavities embedded into nano-photonic wave- guides for Purcell enhanced quantum dot emission — •Stephanie Bauer, Stefan Hepp, Florian Hornung, Mario Schwartz, Simone Luca Portalupi, Michael Jetter, and Peter Michler — Institut für Halbleiteroptik und Funktionelle Grenzflächen, Center for Integrated Quantum Science and Technology (IQST) and SCoPE, Allmandring 3, Universität Stuttgart, 70569 Stuttgart, Germany

Quantum photonic integrated circuits are a promising platform for quantum information technologies. In contrast to silicon based systems, photonic circuits on a III-V semiconductor platform bear the advantage of the direct implementation of quantum dots with their outstanding properties as single photon sources.

The widely used ridge waveguides offer a scalable and low loss routing of quantum dot light on a photonic chip. However, the coupling efficiency of directly integrated emitters is quite poor.

Here we present a method to increase the coupling efficiency between the quantum dots and waveguides via the utilization of a Bragg grating cavity that can be directly integrated into the waveguide. High Q-factors of fabricated cavities in combination with a stable resonance wavelength of ± 0.11 nm over the full fabricated chip show the potential of this design. Furthermore we show the Purcell enhanced quantum dot emission up to a factor of Fp= 3.5 ± 0.5 which can be increased up to a factor of 20 according to FTDT simulations.

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