Photoelectric Sensor Surface Structure for Lower Reflection Loss
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Solution Overview
Problem
Current photoelectric sensors face challenges in improving their photosensitivity performance due to limited light transmission and increased reflection losses at the light-receiving surface.
Innovation Solution
The proposed photoelectric sensor features a substrate with a light-receiving surface that includes a plurality of photosensitive pixel regions with first protrusions smaller than the wavelength of light. A light-transmitting layer covers the surface and fills between these protrusions, reducing reflection losses and enhancing light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a flat light-receiving surface is used, then the device structure is simple, but light transmission is limited and reflection losses increase
Solution Approach 1:
The light-receiving surface is segmented into multiple protrusions rather than being flat, which reduces reflection losses by creating multiple interfaces for light to enter the photosensitive regions at different angles, thereby improving light transmission efficiency
Solution Approach 2:
The surface structure transitions from a two-dimensional flat plane to a three-dimensional protrusion array, adding vertical dimensionality to optimize light interaction. The protrusions have specific height and width dimensions that are optimized to be smaller than the wavelength of incident light to minimize reflection while maximizing transmission
2Reliability
If the pixel region area is increased to improve optical sensitivity, then light reception capability improves, but reflection losses increase
Solution Approach 1:
Different regions of the light-receiving surface have different properties: the protrusions are optimized for light transmission with dimensions smaller than the wavelength of light, while the spaces between protrusions are filled with light-transmitting material. This local differentiation allows each region to contribute optimally to reducing reflection losses while maintaining high optical sensitivity
Solution Approach 2:
A light-transmitting layer is introduced as an intermediary substance filling the spaces between protrusions. This intermediary material has optimized refractive index properties that facilitate light transmission from the protrusions to the photosensitive regions, reducing reflection losses at interfaces while maintaining optical sensitivity
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
This configuration effectively increases the number of transmitted photons, improves light signal collection, and enhances the photoelectric detection efficiency by minimizing reflection losses and maximizing light transmission.
Implementation Method 1
A photoelectric sensor is a device that converts optical signals into electrical signals. Its working principle is based on the photoelectric effect, which occurs when electrons in certain materials absorb the energy of photons upon exposure to light, resulting in corresponding electrical effects.
Implementation Method 2
The light-transmitting layer covering the light-receiving surface of the substrate and filling between adjacent first protrusions of the plurality of first protrusions
Data Source
AI summary
The present disclosure discloses a photoelectric sensor and a forming method thereof. The photoelectric sensor includes a substrate and a light-transmitting layer. The substrate has a light-receiving surface and includes a plurality of photosensitive pixel regions. Each photosensitive pixel region includes a plurality of pixel units arranged in a matrix. In a pixel unit, a plurality of first protrusions are formed in the light-receiving surface of the substrate, and both a lateral dimension and a vertical dimension of a first protrusion of the plurality of first protrusions are smaller than a wavelength of light. The light-transmitting layer covering the light-receiving surface of the substrate and filling between adjacent first protrusions of the plurality of first protrusions.