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Infrared full-band two-dimensional four-way polarization modulation grating

A polarization modulation, full-band technology, applied in the field of infrared full-band two-dimensional four-way polarization modulation grating, can solve the problems of difficult process, difficult to completely cover the photosensitive area, and affecting the ability of the detector to detect the polarization information of the target, etc. Achieve the effect of simplifying the optical imaging system

Active Publication Date: 2021-08-17
XIAN TECH UNIV
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Problems solved by technology

However, since this type of distribution will introduce the problem of crosstalk between gratings with different polarization angles, and it is difficult for the polarization grating to completely cover the entire photosensitive area, the extinction ratio of the actually produced polarization grating is much lower than the theoretical value, which seriously affects the detection. The ability of the sensor to detect the polarization information of the target
At the same time, with the development of infrared focal plane detectors in the direction of large-scale, miniaturization, and integration, as well as the demand for larger field of view and higher resolution, it is difficult for existing micro-fabrication processes to develop on such focal-plane detectors. The process of growing sub-wavelength metal polarization gratings with super-pixel arrangement is difficult and costly

Method used

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  • Infrared full-band two-dimensional four-way polarization modulation grating
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  • Infrared full-band two-dimensional four-way polarization modulation grating

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Embodiment

[0054] Polarization imaging detection technology can not only obtain information such as light intensity of traditional imaging targets, but also obtain polarization multidimensional information. When polarization imaging is performed on the target, the artificial target has polarization properties different from the natural background. Using this feature, it can well detect and recognize man-made targets in complex natural backgrounds. For example, a reflective mine target has stronger radiation polarization characteristics than a diffuse background.

[0055] see image 3 , 3(a) is the visibility image under natural light, in which there are 5 mine targets, 3(b) is the visibility image after growing grass under natural light, 3(c) is the infrared intensity image, 3(d) is using the present invention Computationally obtained infrared polarization images. It is evident that only 3 mines were identified using IR intensity imaging, while all 5 mines were identified using IR pol...

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Abstract

The invention provides an infrared full-band two-dimensional four-way polarization modulation grating. The infrared full-band two-dimensional four-way polarization modulation grating comprises a photoelectric imaging detection assembly and a virtual polarization pixel grating. The virtual polarization pixel grating has four polarization directions; light intensity signals, received by the detector, of the incident wave surface at each moment are modulated into four-direction polarization signals in real time through the virtual polarization pixel grating, the four-direction polarization signals are fused, and incident wave surface information is analyzed. According to the invention, four-direction modulation can be carried out on all-infrared band polarization information of a target, so that full-band surface information of the target is restored, and the high transmittance and the extinction ratio are achieved.

Description

technical field [0001] The invention relates to the technical field of polarization gratings, in particular to an infrared full-band two-dimensional four-directional polarization modulation grating. Background technique [0002] At present, there are two main distribution methods for on-chip subwavelength polarization gratings, one is composed of a 0° polarization direction, a 45° polarization direction and two non-polarization pixels, and the other is composed of four polarization directions Composition, that is, 0°, 45°, 90° and 135°, and arranged in the way of superpixels. These two methods can completely obtain the three parameters S0, S1 and S2 in the Stokes vector through calculation. However, since this type of distribution will introduce the problem of crosstalk between gratings with different polarization angles, and it is difficult for the polarization grating to completely cover the entire photosensitive area, the extinction ratio of the actually produced polariz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/89G01S7/481
CPCG01S17/89G01S7/4811
Inventor 杨利红陈智利阳志强巩蕾万文博武银子
Owner XIAN TECH UNIV
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