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Efficiently Coupling Light to Superconducting Nanowire Single-Photon Detectors

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5 Author(s)
Xiaolong Hu ; Dept. of Electr. Eng. & Comput. Sci., Massachusetts Inst. of Technol., Cambridge, MA, USA ; Holzwarth, C.W. ; Masciarelli, D. ; Dauler, E.A.
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We designed superconducting nanowire single-photon detectors (SNSPDs) integrated with silver optical antennae for free-space coupling and a dielectric waveguide for fiber coupling. According to our finite-element simulation, (1) for the free-space coupling, the absorptance of the NbN nanowire for TM-polarized photons at the wavelength of 1550 nm can be as high as 96% by adding silver optical antennae; (2) for the fiber coupling, the absorptance of the NbN nanowire for TE-like-polarized photons can reach 76% including coupling efficiency at the wavelength of 1550 nm by adding a silicon nitride waveguide and an inverse-taper coupler.

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Applied Superconductivity, IEEE Transactions on  (Volume:19 ,  Issue: 3 )