Berlin 2024 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 37: Poster IV

HL 37.22: Poster

Wednesday, March 20, 2024, 18:00–20:30, Poster F

In-plane coupling between a WGM micro-ring and a ridge waveguide — •Léo J. Roche¹, Yuhui Yang¹, Fridtjof Betz², Ching-Wen Shih¹, Aris Koulas-Simos¹, Sven Burger², and Stephan Reitzenstein¹ — ¹Institut für Festkörperphysik (TUB), Berlin, Germany — ²Zuse Institute Berlin, Berlin, Germany

Integrated quantum photonic circuits (IQPCs) are very promising can- didates for scalable and flexible on-chip quantum computation and quantum communication hardware. One critical requirement for their realization is the scalable integration of on-demand indistinguishable single-photon emitters. This is potentially possible through the resonant excitation of an integrated QD in a waveguide by means of an on-chip integrated coherent light microlaser. Towards this goal, we investigate the coupling and lasing properties of coherent light laterally emitted from a whispering gallery mode (WGM) type micro-ring resonator evanescently coupled to a single mode ridge waveguide. Using finite element method (FEM) simulations, we investigate the optimal geometrical parameters maximising the coupling efficiency between the two structures. The III-V semiconductor type nanostructures composed of a GaAs cavity with InGaAs QDs, on top of a SiO2 layer are processed using high-resolution electron beam lithography. Various geometries of the micro-ring coupled to waveguide with grating outcoupler are processed and subsequently investigated via micro-photoluminescence spectroscopy to provide a systematic study.

Keywords: photonics; quantum dots; GaAs; WGM; micro-ring