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Description
Integrated quantum photonic circuits (IQPCs) are very promising candidates for scalable and flexible on-chip quantum computation and quantum communication hardware. One critical requirement for their realization is the scalable integration of quantum emitters delivering single indistinguishable photons on-demand. This is potentially possible through the resonant excitation of an integrated QD in a waveguide by means of an on-chip integrated microlaser [1]. Towards this goal, we investigate the coupling and lasing properties of laterally emitting whispering gallery mode (WGM) type micropillar resonators evanescently coupled to single mode ridge waveguides, following numerically optimized design rules [2]. The IQPCs are based on III-V QD-heterostructures composed of a GaAs cavity sandwitched between two, distributed Bragg Reflectors, and an activle layer consisting of self-assembled InGaAs QDs, and are processed using high-resolution electron beam lithography and plasma etching. Various geometries of micropillars coupled to waveguides with grating outcouplers are processed and subsequently investigated systematically via micro-photoluminescence spectroscopy for a systematic study.
[1] S. Rodt, S. Reitzenstein, APLPhotonics2021, 6, 1.
[2] L. J. Roche and al., Numerical Investigation of a Coupled Micropillar - Waveguide System for Integrated Quantum Photonic Circuits. Adv Quantum Technol. 2024, 2400195.
