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EFFICIENT POLARIZATION INDEPENDENT SINGLE PHOTON DETECTOR

A superconducting nanowire single photon detector (SN-SPD) microelectric circuit is describes which has higher quantum efficency and signal-to-noise than any SN-SPD's known in the art. The material and configuration of the microelectronic circuit eliminates the polarization independence  and high signal-to-noise is achieved by vertically stacking two tungsten cilicide (TS) SN-SPDs and electrically connecting them in parallel. This structure forms a multilayer superconducting nanowire avalanche photo-detector (SNAP). A single photon detection devive employing the multilayer (SNAP) microelectronic circuit demonstrates a peak system detection efficiency of 87.7% and a polarization dependence of less than 2%. This represents nearly an order of magnitude improvement in both system detection efficiency and reduction in polarization dependence compared to conventional SNSPDs. 
Inventors: 
Burm Baek, Sae woo Nam
Patent Number: 
9,240,539
Internal Laboratory Ref #: 
11-011
Phone: 
301-975-2573
Email: 
tpo@nist.gov
Lab Representatives
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