Meta-Surface Polarizer Imaging for Precise Pixel Light Condensing
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Solution Overview
Problem
Conventional image sensors with meta-surface polarizers face issues with polarized light not being appropriately incident and condensed on the central portion of the corresponding pixel, leading to decreased sensitivity as the incident angle increases, with light often leaking to adjacent pixels.
Innovation Solution
A photodetection device incorporating a polarization control unit with fine structures that selectively emits polarized lights and a light condensing unit, such as a diffractive optical element or lens, to ensure each polarized light is condensed on the correct pixel, using diffraction or refraction principles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a meta-surface polarizer is used to improve polarized light receiving sensitivity, then the sensitivity is improved, but as the incident angle increases, polarized light leaks to adjacent pixels and the sensitivity decreases
Solution Approach 1:
A light condensing unit is introduced as an intermediary component between the meta-surface polarizer and the pixel array. This unit specifically condenses obliquely incident polarized light onto the central portion of the corresponding pixel, preventing light leakage to adjacent pixels while maintaining high receiving sensitivity even at large incident angles
2Measurement precision
If the pixel size is miniaturized to increase resolution, then the resolution is improved, but the light condensation becomes more difficult and leakage to adjacent pixels increases
Solution Approach 1:
The light condensing unit serves as a mediator that effectively handles obliquely incident light and directs it to the central portion of each pixel. This intermediary mechanism is particularly effective for miniaturized pixels, maintaining precise light condensation and preventing leakage even when pixel dimensions are reduced to enhance resolution
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device effectively condenses polarized light on the intended pixel, reducing leakage to adjacent pixels and maintaining high sensitivity even at varying incident angles, especially with miniaturized pixels.
Implementation Method 1
a polarization control unit that includes a plurality of fine structures and selectively emits a plurality of polarized lights in incident light
Implementation Method 2
The light condensing unit may include a diffractive optical element that condenses the plurality of polarized lights on respectively corresponding pixels using diffraction
Implementation Method 3
The light condensing unit may include a lens that condenses the plurality of polarized lights on respectively corresponding pixels using refraction
Data Source
AI summary
Provided is a photodetection device including a polarizer having a meta-surface structure, the photodetection device being advantageous for appropriately condensing each polarized light in incident light on a corresponding pixel. The photodetection device includes a polarization control unit that includes a plurality of fine structures arrayed two-dimensionally and selectively emits a plurality of polarized lights in incident light, a photoelectric conversion unit that includes a plurality of pixels receiving the plurality of polarized lights, and a light condensing unit that is positioned between the polarization control unit and the photoelectric conversion unit and condenses the plurality of polarized lights on respectively corresponding pixels.