Superconducting nanowire-based single-photon polarization detection device and implementation device thereof

Abstract

The invention relates to a superconducting nanowire-based single-photon polarization detection device and an implementation device thereof. The superconducting nanowire-based single-photon polarization detection device comprises a substrate and a pixel layer arranged on the substrate, wherein the pixel layer comprises one or more super pixel units, each super-pixel unit comprises at least four pixel units, and each pixel unit is composed of a zigzag superconducting nanowire; the angles of the superconducting nanowire structures of the pixel units in the parallel direction are different, and the polarization state of the linearly polarized light can be solved by counting the light response of the four superpixels to the polarization angle of the polarized light. Compared with an existing semiconductor polarization detection device, the superconducting nanowire structure has dual functions of a linear polarizer and a photon detector, not only integrates the advantages of a superconducting nanowire structure single photon detector, but also has the characteristics of expandable device scale, simple structure and the like, so that the superconducting nanowire-based single-photon polarization detection device is expected to be applied to the polarization detection and imaging, quantum communication, astronomical observation and the like in a weak light environment.

Description

technical field [0001] The present application relates to the field of light detection, in particular to a superconducting nanowire-based single-photon polarization detection device and its realization device. Background technique [0002] Polarization is an important piece of information about light. Polarization detection (PD), as a useful supplement to intensity detection, can expand the amount of information from three dimensions (light intensity, spectrum, and space) to seven dimensions (light intensity, spectrum, space, degree of polarization, polarization azimuth, polarization The direction of ellipse and rotation), which helps to improve the accuracy of target detection and object recognition. [0003] The structure of existing semiconductor polarization detectors is generally divided into time-division detection, amplitude-division detection, aperture-division detection and focal-plane detection. On the focal plane of the pixel, every four pixels form a super pixe...

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Problems solved by technology

[0004] However, the matching error between the micro-polarizer of the existing semiconductor polarization detector and the CCD pixel and the uniformity of the extinction ratio of the pixel will increase the difficulty of the process.

Moreover, the photodetection performance of existing semiconductor polarization detectors depends on the integrated CCD pixel array at the bottom layer, and the general sensitivity does not reach the single-photon level, especially the performance in the near-infrared band, such as single-photon detection efficiency, dark count rate, Detection rate, integration, etc. still need to be improved

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