High polarization ratio single photon detector based on superconductive nanowires
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A single-photon detector and superconducting nanowire technology, applied in the field of light detection, can solve the problems of low polarization ratio, large volume, and complex structure of polarization detection devices, and achieve the effects of low dark count, small volume, and simple structure
Inactive Publication Date: 2014-10-08
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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[0008] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a high polarization ratio single photon detector based on superconducting nanowires, which is used to solve the polarization comparison of superconducting nanowire single photon detectors in the prior art Low, or other problems with complex structures and large volumes of polarization detection devices
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Embodiment 1
[0042] Such as Figure 1 ~ Figure 2 and Figure 4 As shown, this embodiment provides a high polarization ratio single photon detector based on superconducting nanowires, which includes:
[0043] Substrate 10;
[0044] An anti-reflection layer 20, bonded to the surface of the substrate 10;
[0045] Superconducting nanowires 30 are bonded to the surface of the anti-reflection layer 20 in a periodic meandering structure, the width of the superconducting nanowires 30 is not greater than 75 nanometers, the thickness is not less than 7 nanometers, and the duty cycle is not greater than 40%.
[0046] As an example, the superconducting nanowire-based high polarization ratio single-photon detector of this embodiment is a superconducting nanowire 30 single-photon detector with a front-incidence structure.
[0047] As an example, the polarization ratio of the single photon detector decreases as the width of the superconducting nanowire 30 increases, and increases as the thickness inc...
Embodiment 2
[0056] Such as image 3 As shown, this embodiment also provides a high polarization ratio single photon detector based on superconducting nanowires, including:
[0057] A substrate 10, the upper and lower surfaces of the substrate 10 are respectively combined with an upper anti-reflection layer 50 and a lower anti-reflection layer 40;
[0058] The optical cavity structure 60 is combined with the surface of the upper anti-reflection layer 50;
[0059] A mirror 70, combined with the surface of the optical cavity structure 60;
[0060] The superconducting nanowire 30 is combined in a periodic meandering structure between the upper anti-reflection layer 50 and the optical cavity structure 60, the width of the superconducting nanowire 30 is not greater than 75 nanometers, and the thickness is not less than 7 nanometers, the duty cycle is no greater than 40%.
[0061] As an example, the superconducting nanowire-based high polarization ratio single-photon detector of this embodime...
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Abstract
The invention provides a high polarization ratio single photon detector based on superconductive nanowires. The high polarization ratio single photon detector based on the superconductive nanowires comprises a substrate, an anti-reflection layer and the superconductive nanowires, wherein the anti-reflection layer is combined to the surface of the substrate, the superconductive nanowires are combined to the surface of the anti-reflection layer in a periodic winding structure, the width of the superconductive nanowires is not larger than 75 nanometers, the thickness is not larger than 7 nanometers, and the duty ratio is not larger than 40 percent. According to the high polarization ratio single photon detector based on the superconductive nanowires, the width, the thickness and the duty ratio of the superconductive nanowires of the single photon detector are adjusted, and a large polarization ratio of the single photon detector is achieved. Compared with a traditional polarization detector, the high polarization ratio single photon detector based on the superconductive nanowires has the advantages of being small in size, simple in structure, high in sensitivity, low in dark counting and the like, and external integration of polarization devices is not needed.
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 ratio single photon detector based on a superconducting nanowire. Background technique [0002] Superconducting Nanowire Single Photon Detector (SNSPD) is an important photon detector, which can realize single photon detection from visible light to infrared band. [0003] When SNSPD works, it is placed in a low temperature environment (<4K), the device is in a superconducting state, and a certain bias current I is applied. b , I b slightly less than the device critical current I c . When a single photon is incident on the nanowire in the device, it will break up the Cooper pair and form a large number of hot electrons, thus forming a localized hot spot, which is under the bias current I b Due to the diffusion of Joule heat under the action of the nanowires, the local quenching of ...
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Patent Type & Authority Applications(China)
IPC IPC(8): H01L39/08H01L39/10G01J1/42
Inventor 尤立星李浩郭琦张伟君张露王镇
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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