Suspended Spot-Size Converters for Scalable Single-Photon Devices

Uğurlu, A.D. and Thyrrestrup, H. and Uppu, R. and Ouellet-Plamondon, C. and Schott, R. and Wieck, A.D. and Ludwig, Ar. and Lodahl, P. and Midolo, L.

Volume: 3 Pages:
DOI: 10.1002/qute.201900076
Published: 2020

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 is reported. The converter is realized using an inverted taper and an epoxy polymer overlay providing a 1.3 µm output mode field diameter. The collection of single photons from a quantum dot into a lensed fiber with a rate of 5.84 ± 0.01 MHz is demonstrated and a chip-to-fiber coupling efficiency of ≈48% is estimated. 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. © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

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