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Superconductive nano wire single-photon detector having double bandwidth

A single-photon detector, superconducting nanowire technology, applied in nanotechnology, nanotechnology, nanotechnology and other directions for materials and surface science, can solve problems such as reduced detection efficiency, achieve high absorption rate, and improve detection efficiency Effect

Active Publication Date: 2018-01-09
NANJING UNIV
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Problems solved by technology

However, this simple optical resonant cavity can only realize the high-efficiency characteristics of SNSPD at one wavelength, and the detection efficiency of other wavelengths will be reduced instead.
Therefore, this SNSPD is only suitable for single-channel information transmission

Method used

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Embodiment Construction

[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0020] Such as figure 1 As shown, a double-bandwidth superconducting nanowire single photon detector, including a substrate 1, a first Bragg mirror 2, a silicon layer 3, a silicon dioxide layer 4, a niobium nitride nanowire 5 and a second Bragg reflector Mirror 6. The first Bragg reflector 2 is arranged on the upper surface of the substrate 1 and includes several periodic dielectric layers 20 . The silicon layer 3 is disposed on the upper surface of the first Bragg reflector 2 . A silicon dioxide layer 4 is provided on the upper surface of the silicon layer 3 . The niobium nitride nanowires 5 are arranged inside the silicon dioxide layer 4 . The second Bragg reflector 6 is disposed on the upper surface of the silicon dioxide layer 4 and includes several periodic dielectric layers 60 . The number of periods included in the first Bragg reflector 2 and the ...

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Abstract

The invention discloses a superconductive nano wire single-photon detector having double bandwidth, comprising a substrate, a first Bragg reflection mirror, a silicon layer, a silicon dioxide layer, anitridation niobium nano wire and a second Bragg reflection mirror. The first Bragg reflection mirror and the second Bragg reflection mirror both include a periodicity dielectric layer having a plurality of periods, and the first Bragg reflection mirror and the second Bragg reflection mirror have different periodic number. The first Bragg reflection mirror is disposed at the upper surface of thesubstrate, and the silicon layer is disposed at the upper surface of the first Bragg reflection mirror. The silicon dioxide layer is disposed at the upper surface of the silicon layer. The nitridationniobium nano wire is disposed in the silicon dioxide layer. The second Bragg reflection mirror is disposed at the upper surface of the silicon dioxide layer. The invention is advantageous in that thephoton absorptivity of the photon of the corresponding wave band of two single-mode fibers G652 and G655 by the single-photon detector can be over 95%, and the single-photon detector has industrial application value.

Description

technical field [0001] The invention relates to a superconducting nanowire single photon detector. Background technique [0002] Superconducting Nanowire Single Photon Detector (SNSPD) is a new type of single photon detector based on the transition of superconducting materials from superconducting state to normal state. It has good comprehensive performance such as high detection efficiency, low dark count, small time jitter and fast recovery time. Based on the excellent performance of SNSPD, it has been applied in many fields such as quantum communication, deep space communication, integrated circuit detection, laser ranging and so on. [0003] Among the applications of SNSPD, quantum key distribution is one of the most important applications. In the process of using SNSPD to detect photons to realize information transmission, the efficiency of the detector determines the bit error rate of the system. Therefore, in order to improve the detection efficiency of SNSPD, the ...

Claims

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Application Information

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IPC IPC(8): H01L31/09H01L31/0232G01J11/00B82Y30/00
Inventor 金飚兵韩诗颖郑帆朱广浩康琳许伟伟陈健吴培亨
Owner NANJING UNIV
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