Absorptive Grid Polarization Element for UV Light
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Solution Overview
Problem
Conventional wire grid polarization elements are not suitable for ultraviolet light due to reduced reflectance and limited polarization capability, requiring multiple elements for different wavelengths and being sensitive to manufacturing irregularities, which increases costs and affects product stability.
Innovation Solution
An absorption-type grid polarization element with a transparent silica glass substrate and a stripe-like grid composed of alternating layers of amorphous titanium oxide and amorphous silicon, optimizing light absorption between s and p polarized light to achieve high extinction ratios across a wide ultraviolet wavelength range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wire grid polarization element is used for ultraviolet light, then the polarization capability is reduced due to reduced reflectance, but using multiple elements for different wavelengths increases device complexity and cost
Solution Approach 1:
The patent applies composite materials by combining multiple layers with different optical properties (conductive layer, dielectric layers, and metal layers) to create a single polarization element that can effectively polarize ultraviolet light across a broad wavelength range, eliminating the need for multiple separate elements
Solution Approach 2:
The invention creates a universal polarization element that can handle multiple ultraviolet wavelengths simultaneously through its multi-layer structure, making it applicable across different UV wavelength ranges without requiring wavelength-specific elements
2Reliability
If conventional wire grid polarization elements are used, then manufacturing irregularities affect product stability, but increasing manufacturing precision increases cost
Solution Approach 1:
The patent changes the structural parameters from a simple single-layer wire grid to a multi-layer structure with specific thickness ratios and material compositions, which makes the polarization performance less sensitive to manufacturing variations and more stable across production batches
3Adaptability or versatility
If a single polarization element is used for broad wavelength range, then the extinction ratio may be compromised, but using multiple elements increases device complexity
Solution Approach 1:
The multi-layer composite structure combines materials with complementary absorption and reflection characteristics across different UV wavelength ranges, achieving both broad wavelength coverage and high extinction ratio simultaneously in a single element
Solution Approach 2:
Different layers in the structure are designed with specific local properties optimized for different wavelength ranges, with the conductive layer, dielectric layers, and metal layers each contributing to polarization performance at specific wavelength bands
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 solution provides stable and efficient polarization across a wide wavelength range, reducing facility costs and enhancing product stability by maintaining high polarization quality despite manufacturing tolerances.
Implementation Method 1
each linear part is configured to absorb first polarized light among incident light, which has a polarization axis directed in a particular direction, more than second polarized light, which has a polarization axis directed in a direction other than the particular direction, to achieve polarization
Data Source
AI summary
An absorptive grid polarization element includes a transparent substrate, and a stripe-like grid provided on the transparent substrate. Each of a plurality of linear parts which form the grid absorbs more s polarization light than p polarization light, and thus achieves a polarizing action. The transparent substrate is made of quartz glass. Each of the linear parts includes a second layer formed on the transparent substrate, and a first layer formed on the second layer. The first layers are formed from amorphous titanium oxide. The second layers are formed from amorphous silicon.