Single-photon detector and preparation method

A single-photon detector, superconducting wire technology, applied in the field of light detection, can solve problems affecting device performance, current crowding effect, etc.
CN112229510AActive Publication Date: 2021-01-15SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
Publication Date
2021-01-15

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Abstract

The invention provides a single-photon detector and a preparation method, the single-photon detector comprises a substrate and a superconducting wire formed on the substrate, and the superconducting wire comprises a plurality of straight line parts and corner parts connected with the straight line parts, wherein the thickness of the corner part of the superconducting wire is greater than that of the straight line part. According to the single-photon detector and the preparation method, the thickness of the corner part of the superconducting wire is increased (greater than the thickness of thestraight line part), so that the critical current of the corner area is increased. Although the corner part of the superconducting wire still has a current crowding effect, the corner area is no longer a bottleneck for limiting the critical current of the whole superconducting wire because the overall critical current of the corner area is increased to be higher than the critical current level ofthe straight line part, thereby achieving the purpose of inhibiting adverse effects caused by the current crowding effect of the corner area.
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Description

technical field

[0001] The invention relates to the technical field of light detection, in particular to a single photon detector and a preparation method. Background technique

[0002] As a new single-photon detection technology, superconducting nanowire single-photon detector (SNSPD) has significantly better performance than other known ones in terms of detection efficiency, dark count rate, time jitter and maximum count rate. light detector. At present, SNSPD plays an important role in the fields of quantum optics, single photon ranging imaging and quantum key distribution.

[0003] The system detection efficiency (SDE) of SNSPD can usually be expressed as SDE=η coup ×η abs ×η ide , where η coup is the optical coupling efficiency, η abs is the photon absorption efficiency, η ide is the intrinsic detection efficiency. In order to receive incident photons to the maximum extent, the η of SNSPD should be increased coup , the photosensitive surface of SNSPD (15-20 μm ...

Claims

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