Quantum dot single photon source on SiN integrated with coupled crossover waveguides

TL;DR

This paper demonstrates a hybrid integration method for InAs/GaAs quantum dot single-photon sources on SiN photonic circuits using coupled crossover waveguides, enabling efficient photon transfer and emission enhancement.

Contribution

It introduces a novel hybrid integration technique with a coupled crossover waveguide structure for efficient quantum dot photon coupling on SiN circuits.

Findings

Purcell-enhanced single-photon emission observed

Efficient photon transfer through coupled waveguides demonstrated

On-chip photon propagation and outcoupling confirmed

Abstract

Hybrid integration of InAs/GaAs quantum dot (QD) single-photon sources (SPSs) is a promising approach for introducing quantum light into SiN photonic integrated circuits. However, the large refractive-index mismatch between GaAs and SiN poses a challenge for efficient optical coupling. Here, we propose and experimentally demonstrate hybrid integration of an InAs/GaAs QD-SPS on SiN using a coupled crossover waveguide structure. A photonic crystal nanocavity is employed for coupling QD emission into a GaAs waveguide, which efficiently transfers photons to a SiN waveguide at the crossover section. We observed Purcell-enhanced single-photon emission, on-chip propagation, and outcoupling through a SiN grating coupler.