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Superconducting nanowire single photon detector and its preparation method

A single-photon detector and superconducting nanowire technology, applied in the field of light detection, can solve the problems of uncontrollable polarization state, unfavorable to the widespread application of SNSPD, and SNSPD cannot exert high detection efficiency, etc., and achieves low polarization sensitivity. Effect

Active Publication Date: 2022-06-24
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 its preparation method
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[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 light detection, and relates to a superconducting nanowire single-photon detector and a preparation method thereof. The superconducting nanowire single photon detector includes: a substrate; a reflective layer located on the surface of the substrate; a detection layer located on the surface of the reflective layer for detecting photons, and the detection layer includes several superconducting nanowires A wire unit; a matching layer, at least located on the surface of the superconducting nanowire unit and covering the superconducting nanowire unit, at least for reducing the polarization extinction ratio of the superconducting nanowire unit; The photon detector is provided with a matching layer covering the superconducting nanowire unit, which can use the matching layer to reduce the polarization extinction ratio of the superconducting nanowire single photon detector, thereby reducing the polarization sensitivity of the superconducting nanowire single photon detector and expanding The application field of the superconducting nanowire single photon detector improves the accuracy and repeatability of its detection.

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 Patents(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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