Superconducting nanowire single-photon detector with high polarization extinction ratio and high efficiency

Abstract

The invention discloses a superconducting nanowire single-photon detector with high polarization extinction ratio and high efficiency. The superconducting nanowire single-photon detector comprises a substrate, a medium partially-reflecting mirror combined on the surface of the substrate, a lower optical cavity combined on the surface of the medium partially-reflecting mirror, NbN nanowires combined at the internal part of the lower optical cavity in a periodic winding structure, an upper optical cavity combined on the surface of the lower optical cavity, metal nanowires combined between the lower optical cavity and the upper optical cavity in a periodic structure, and a totally-reflecting mirror combined on the surface of the upper optical cavity. According to the superconducting nanowire single-photon detector, problems of low light absorptivity and polarization extinction ratio and low efficiency of the superconducting nanowire single-photon detector in the prior art are solved.

Description

technical field [0001] The invention belongs to the technical field of light detection, and relates to a superconducting nanowire single-photon detector, in particular to a high-polarization extinction ratio and high-efficiency superconducting nanowire single-photon detector, in particular to a metal nanowire-based single-photon detector High polarization extinction ratio of wire and high efficiency superconducting nanowire single photon detector. Background technique [0002] Superconducting Nanowire Single Photon Detector (Superconducting Nanowire Single Photon Detector, SNSPD) is a new type of single photon detector, which can realize single photon detection from visible light band to infrared band. [0003] SNSPD generally works in a low temperature environment lower than 4K, and adds a bias current slightly smaller than the critical current. When a single photon is absorbed by a superconducting nanowire, the Cooper electron pairs are destroyed to generate a large numbe...

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Problems solved by technology

[0007] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a high polarization extinction ratio and high efficiency superconducting nanowire single photon detector based on metal nanowires, which is used to solve the problem of superconducting nanowires in the prior art. The problem of insufficient high polarization extinction ratio and low efficiency of light absorptivity of line single photon detectors

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