Polarization imaging lens based on metasurface, design method and detection system

Abstract

The invention discloses a polarization imaging lens based on a metasurface, a design method and a detection system, and belongs to the field of polarization imaging and polarization detection. Nano-column arrays are divided into three groups, each group corresponds to x / y, 45 degrees / -45 degrees and left / right-handed circular polarization components, nano-columns among the three groups of nano-column units are periodically and alternately distributed at intervals, scattered light passing through an object is incident to the three groups of nano-column units, and on the basis of corresponding orthogonal off-axis focusing phases, the three groups of nano-column units are focused on the same plane. And the three pairs of orthogonal polarization state components are respectively imaged at different positions of the same image plane at the same time to form six images with different polarization states. According to the invention, real-time high-resolution polarization imaging of an object is realized, and a compact and miniaturized scheme is provided for polarization imaging.

Description

technical field [0001] The invention belongs to the field of polarization imaging and polarization detection, and more particularly, relates to a metasurface-based polarization imaging lens, a design method and a detection system. Background technique [0002] Independent of the light's intensity, phase, and frequency, polarization describes the direction in which light vibrates. Due to the anisotropy of the object, after the interaction between light and matter, the scattered light is partially polarized light. By detecting the polarization state of the scattered light, the characteristic information related to the polarization of the object, such as the texture and morphology of the object surface, can be obtained. Therefore, polarization detection and polarization imaging have a very wide range of applications in many fields such as biomedicine, military, mineral exploration, and aerospace remote sensing. [0003] The polarization of light can be described using Stokes p...

AI Technical Summary

Problems solved by technology

However, traditional cameras can only perceive the intensity of light and cannot collect the polarization information of incident light. Therefore, it is of great significance to develop new polarization imaging devices to record the polarization information of objects.

[0004] At present, the methods of polarization detection and imaging are mainly divided into three types: the split-amplitude polarization detection system that separates the beam and passes through different polarization elements to extract different polarization information. The optical path of the system is complex, and the multi-channel detector data processing makes The accuracy and real-time performance of data processing are affected; or add different polarization elements in front of different pixels of the detector to filter out different polarization state components of the focal plane polarization detection system, which compresses the optical path to a certain extent However, its efficiency and resolution will decrease; or it is a time-sharing polarization detection system that adjusts the polarization element placed in front of the detector at a certain time interval to obtain the polarization information of the object. Although this system solves the problems of the above two methods, However, it is impossible to detect polarization information in real time, which seriously limits its use scenarios

More importantly, none of the polarization detection and imaging methods in the prior art can achieve real-time high-resolution polarization detection and imaging

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