摘要
Despite very efficient superconducting nanowire single-photon detectors(SNSPDs)reported recently,combining their other performance advantages such as high speed and ultralow timing jitter in a single device still remains challenging.In this work,we present a perfect absorber model and the corresponding detector design based on a micrometer-long NbN nanowire integrated with a 2D photonic crystal cavity of ultrasmall mode volume,which promises simultaneous achievement of near-unity absorption,gigahertz counting rates,and broadband optical response with a 3 dB bandwidth of 71 nm.Compared to previous stand-alone meandered and waveguideintegrated SNSPDs,this perfect absorber design addresses the trade space in size,efficiency,speed,and bandwidth for realizing large on-chip single-photon detector arrays.
基金
Army Research Office(W911NF-16-2-0151)
Division of Emerging Frontiers in Research and Innovation(EFMA-1640959)
Multidisciplinary University Research Initiative(FA95550-15-1-0029).
