A Waveguide-Coupled On-Chip Single Photon Source

TL;DR

This paper demonstrates a highly efficient on-chip single photon source using quantum dots coupled to a photonic crystal waveguide, achieving high emission rates and strong directional emission for quantum photonics applications.

Contribution

It introduces a method to integrate quantum dots with photonic crystal waveguides, achieving high coupling efficiency and on-chip single photon emission.

Findings

Coupling efficiency exceeds 85%.

Potential emission rates over 1 GHz.

Precise positioning of quantum dots within waveguides.

Abstract

We investigate single photon generation from individual self-assembled InGaAs quantum dots coupled to the guided optical mode of a GaAs photonic crystal waveguide. By performing confocal microscopy measurements on single dots positioned within the waveguide, we locate their positions with a precision better than 0.5 \mum. Time-resolved photoluminescence and photon autocorrelation measurements are used to prove the single photon character of the emission into the propagating waveguide mode. The results obtained demonstrate that such nanostructures can be used to realize an on-chip, highly directed single photon source with single mode spontaneous emision coupling efficiencies in excess of beta~85 % and the potential to reach maximum emission rates >1 GHz.