Ultra-compact spectral light field camera system based on super-structured lens array

Abstract

An ultra-compact spectral light field camera system based on a super-structured lens array comprises a parallel light source lens, linear polaroids, quarter-wave plates, objective lenses, the super-achromatic super-structured lens array and a monochromatic camera which are arranged in sequence. The super-achromatic super-structured lens array is arranged between two pairs of linear polaroids, thequarter-wave plates and objective lens composition structures which are arranged in sequence. The distance a from the image plane of the main lens to the super-structured lens array, the distance b from the super-structured lens array to the re-imaging plane and the focal length f of the super-structured lens meet a certain relation, and the camera is arranged on the image plane and used for receiving images; the super-achromatic super-structured lens array is a two-dimensional lens array plane formed by arranging super-achromatic super-structured lenses on a plane according to a certain rule;the super-achromatic super-structured lenses with off-axis focusing properties are designed, and spectral dispersion is realized by utilizing the change of the focusing positions of the super-achromatic super-structured lenses under different wavelengths.

Description

technical field [0001] The invention belongs to the technical field of optical imaging, and relates to a spectral light field camera system based on a metalens array and a phase design method for off-axis focusing of oblique incidence. Background technique [0002] Creatures in nature have many highly special visual systems. For example, the eyes of Pipi shrimp can perceive electromagnetic waves in 12 wavelength channels from ultraviolet to infrared, and the retina has 16 optical receptors, which can perceive both spectral information and depth information. Inspired by natural organisms, imaging systems that can record more information, such as light field cameras and spectral cameras, have been developed. In addition to recording the intensity information on the two-dimensional plane of the scene, the light field camera also contains the depth information of the scene. In addition to recording two-dimensional spatial information, the spectral camera also records the one-d...

AI Technical Summary

Problems solved by technology

However, it is difficult to realize a miniaturized and light-weight imaging system based on these traditional optical components. At the same time, it is limited to the micro-processing level, and it is very difficult to process complex curved micro-lens arrays on a micro scale.

So far, the proposed spectral light field imaging system is subject to many limitations in practical use, such as complex structure, low spectral resolution and low light throughput.

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