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Superconducting nanowire single-photon detector and preparation method thereof

A single-photon detector and superconducting nanowire technology, applied in the field of optical detection, can solve the problems of uncontrollable polarization state, SNSPD cannot exert high detection efficiency, detection efficiency is limited by absorption efficiency, etc., and achieve the goal of reducing polarization sensitivity Effect

Active Publication Date: 2020-12-08
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The polarization sensitivity of SNSPD is not conducive to practical application
In the coherent light detection of conventional optical fiber links, the polarization direction of the incident light can be adjusted by an external polarization controller to achieve high-efficiency detection. In the case of incoherent light detection, the polarization state of photons is uncontrollable. Due to the different absorption efficiencies of SNSPDs for different polarization states of light, the detection efficiency of SNSPDs is limited by the absorption efficiency of TM polarization states of light, making SNSPDs unable to exert high detection efficiency. advantage, which is not conducive to the widespread application of SNSPD

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  • Superconducting nanowire single-photon detector and preparation method thereof
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Embodiment Construction

[0058]Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

[0059] An embodiment of the present invention provides a superconducting nanowire single photon detector, such as figure 1 As shown, the superconducting nanowire single photon detector includes: a substrate 1 , a reflective layer 2 , a detection layer 3 and a matching layer 4 .

[0060] The substrate 1 includes but not limited to a silicon substrate, a magnesium oxide substrate, a potassium arsenide substrate or a sapphire substrate. ...

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Abstract

The invention belongs to the technical field of optical detection, and relates to a superconducting nanowire single-photon detector and a preparation method thereof. The superconducting nanowire single photon detector comprises a substrate; a reflecting layer which is positioned on the surface of the substrate; a detection layer which is located on the surface of the reflection layer and used fordetecting photons, and the detection layer comprises a plurality of superconducting nanowire units; and a matching layer which is at least located on the surface of the superconducting nanowire unit,wraps the superconducting nanowire unit and is at least used for reducing the polarization extinction ratio of the superconducting nanowire unit; by arranging the matching layer coating the superconducting nanowire unit in the superconducting nanowire single-photon detector, the polarization extinction ratio of the superconducting nanowire single-photon detector can be reduced by utilizing the matching layer, so that the polarization sensitivity of the superconducting nanowire single-photon detector is reduced, the application field of the superconducting nanowire single-photon detector is expanded. And the detection accuracy and repeatability are improved.

Description

technical field [0001] The invention belongs to the technical field of light detection, and relates to a superconducting nanowire single-photon detector and a preparation method thereof. Background technique [0002] Superconducting nanowire single-photon detectors (SNSPDs) are highly sensitive photodetectors that utilize photon absorption to excite non-equilibrium hotspots in superconducting nanowires for single-photon detection. Generally, it is made of ultra-thin (~5nm) ultra-fine (~100nm) superconducting material, which has the properties of high detection efficiency, low dark count, small time jitter and fast response rate. With the gradual deepening of people's understanding of SNSPD from mechanism to performance, the performance of SNSPD has been improved rapidly. Recent research results show that: in the near-infrared band, the performance of SNSPDs in all aspects is significantly better than other types of single-photon detectors. At present, the basic and applied...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J1/44B82Y15/00B82Y40/00
CPCG01J1/44B82Y15/00B82Y40/00G01J2001/442
Inventor 李浩张文英尤立星王镇谢晓明
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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