Suspended Spot-Size Converters for Scalable Single-Photon Devices

Abstract

We report on the realization of a highly efficient optical spot-size converter for the end-face coupling of single photons from GaAs-based nanophotonic waveguides with embedded quantum dots. The converter is realized using an inverted taper and an epoxy polymer overlay providing a 1.3~$\mu$m output mode field diameter. We demonstrate the collection of single photons from a quantum dot into a lensed fiber with a rate of 5.84$\pm 0.01$~MHz and estimate a chip-to-fiber coupling efficiency of $\sim 48$~\%. The stability and compatibility with cryogenic temperatures make the epoxy waveguides a promising material to realize efficient and scalable interconnects between heterogeneous quantum photonic integrated circuits.

arXiv comment16 pages, 5 figures, 1 table

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Cited by in corpus (3)

• On-chip deterministic operation of quantum dots in dual-mode waveguides for a plug-and-play single-photon source
• Numerical optimization of single-mode fiber-coupled single-photon sources based on semiconductor quantum dots
• On-demand source of dual-rail photon pairs based on chiral interaction in a nanophotonic waveguide