Numerical optimization of single-mode fiber-coupled single-photon sources based on semiconductor quantum dots

TL;DR

This paper uses numerical simulations to optimize fiber-coupled quantum dot single-photon sources, achieving high coupling efficiencies and providing design guidelines for practical quantum photonic devices.

Contribution

It introduces a comprehensive numerical optimization approach for various quantum dot source geometries to maximize photon coupling efficiency.

Findings

Achieved up to 83% photon coupling efficiency.

Compared different geometries like micromesas, microlenses, and cavities.

Provided optimized designs for practical single-photon sources.

Abstract

We perform extended numerical studies to maximize the overall photon coupling efficiency of fiber-coupled quantum dot single-photon sources emitting in the near-infrared and telecom regime. Using the finite element method, we optimize the photon extraction and fiber-coupling efficiency of quantum dot single-photon sources based on micromesas, microlenses, circular Bragg grating cavities and micropillars. The numerical simulations which consider the entire system consisting of the quantum dot source itself, the coupling lens, and the single-mode fiber yield overall photon coupling efficiencies of up to 83%. Our work provides objectified comparability of different fiber-coupled single-photon sources and proposes optimized geometries for the realization of practical and highly efficient quantum dot single-photon sources.