Concave Surface Light Absorbing Structural Body
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Solution Overview
Problem
Existing technologies for enhancing anti-reflection performance in optical apparatuses are insufficient in effectively absorbing light, particularly with structures having pitches equal to or smaller than the wavelength of incident light, or those with concavo-convex structures having pitches larger than the wavelength.
Innovation Solution
A structural body with a substrate having a plurality of concave surfaces on its incident surface, where the light is incident on the inner region of each concave surface, and the dimensions of the concave surfaces are specifically designed to satisfy certain geometric relationships, allowing for efficient light absorption and reduced reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a concavo-convex structure with pitch equal to or smaller than the wavelength of incident light is formed, then anti-reflection performance is enhanced, but light absorption is insufficient
Solution Approach 1:
The incident surface is segmented into multiple concave surfaces with specific geometric parameters. Each concave surface has a depth Dd≥Da and width relationships (Wa>λ, Wb≤λ/2) that segment the light path, causing multiple internal reflections and increasing absorption opportunities while maintaining anti-reflection properties.
Solution Approach 2:
Different regions of the concave surfaces are designed with different local properties. The inner region has specific width characteristics (Wa at distance Da, Wb at distance Db) that create localized light trapping effects, while the overall structure maintains anti-reflection functionality. This local quality differentiation enables both reflection suppression and enhanced absorption.
2Loss of energy
If a concavo-convex structure with pitch larger than the wavelength of incident light is formed, then light absorption is improved, but anti-reflection performance is insufficient
Solution Approach 1:
The geometric parameters of the concave surfaces are precisely controlled to satisfy specific relationships: depth Dd≥Da, widths Wa>λ and Wb≤λ/2 at different distances from the bottom. These parameter changes enable the structure to simultaneously achieve enhanced light absorption through increased path length and maintained anti-reflection performance through appropriate scale relationships with the wavelength λ.
3Loss of energy
If the depth and width of concave surfaces are increased to enhance light absorption, then light trapping is improved, but manufacturing complexity increases
Solution Approach 1:
The concave surfaces are designed with curved geometries rather than sharp edges or complex angular features. This curvature simplifies manufacturing processes while maintaining the light-trapping functionality. The smooth curved surfaces are easier to fabricate using conventional techniques while still achieving the required depth Dd≥Da and width relationships for effective light absorption.
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 structural body effectively absorbs light across a wide wavelength range, significantly reducing reflection and scattering, thereby enhancing the anti-reflection performance and achieving a clear image in optical apparatuses.
Implementation Method 1
A structural body for absorbing light which is incident on the structural body and has a wavelength λ
Implementation Method 2
the light is incident on an inner region of each of the plurality of concave surfaces
Data Source
AI summary
A technology advantageous for achieving a structural body capable of sufficiently absorbing light, provided is a structural body for absorbing light, which is incident on the structural body and has a wavelength λ, the structural body including a substrate having a plurality of concave surfaces on a light incident surface. The light is incident on an inner region of each of the plurality of concave surfaces. The light satisfies 400 nm≤λ≤40 μm. Each of the plurality of concave surfaces satisfies Dd≥Da>Db>λ, Wa>λ, and Wb≤λ/2, where Dd represents a depth of a bottom of the each of the plurality of concave surfaces, Wa represents a width of the inner region at a position of a distance Da from the bottom of the each of the plurality of concave surfaces, and Wb represents a width of the inner region at a position of a distance Db from the bottom.