Single photon polarization imaging array with gathering and smoothing functions

Abstract

The invention discloses a single-photon polarization imaging array with gathering and smoothing functions. According to the structure, polarization detection units are arranged in a two-dimensional periodic mode; each polarization detection unit comprises a single photon detector set and four gathering coupling structures in different polarization directions, wherein the polarization directions are the horizontal direction, the 45-degree right inclination direction, the vertical direction and the 45-degree left inclination direction. The gathering coupling structures are the upper metal grating layer, a transparent medium gathering layer, a metal barrier layer and a lower metal reflecting light-emitting layer according to the sequence in which incident light passes through successively. The single-photon polarization imaging array has the advantages that the three functions of polarization resolution, gathering coupling and smoothing are integrated, and the array can be highly integrated with various single-photon detectors. The huge application value is achieved in the fields such as polarization encoding and single photo polarization imaging technologies in quantum information.

Description

technical field [0001] The invention relates to the field of single-photon detection and polarization imaging, in particular to a single-photon polarization imaging array with a convergence filtering function. Background technique [0002] With the development of single-photon detection technology and the continuous expansion of its application fields, the demand for high-performance single-photon detection technology is increasing, which not only puts forward higher requirements for detection sensitivity (low dark count, high quantum efficiency, short jitter Time, etc.), single-photon polarization detection, as the ultimate sensitivity photon polarization measurement technology, has extremely important application value in the fields of polarization imaging, quantum information technology, biomedicine and astronomy. However, most conventional single-photon detectors are intensity-detecting and not sensitive to polarization. In order to achieve polarization-selective detect...

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Problems solved by technology

In addition, stray light in the background environment will also have an adverse effect on single-photon detection. If the stray light in the background environment can be effectively filtered while converging and coupling, the performance of single-photon detectors will be further improved.

[0004] The publication date is June 19, 2013, and the Chinese invention patent document with the publication number CN103165723A discloses that the converging and coupling effect of small-area detectors can be realized through the ring-shaped converging grating, but there is no polarization detection function; the publication date is April 2014 On the 30th, the Chinese invention patent document with the publication number CN103762220A disclosed that it can realize polarization detection in the infrared band, but the area of ​​the grating is as large as the area of ​​the device, and there is no function of converging coupling and reducing the device table.

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