Wire Grid Polarization Device High Temperature Oxidation
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Solution Overview
Problem
Existing wire grid type polarization devices face issues with temperature-induced cracking, deformation, and oxidation, leading to non-uniform polarization characteristics and reduced performance, especially in high-temperature environments.
Innovation Solution
A polarization device design featuring metal layers with alternating dielectric layers, where the second dielectric layer has a higher optical absorption rate than the first, and is strategically positioned to absorb TE waves while preventing metal layer oxidation, ensuring uniform polarization characteristics across the surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a wire grid type polarization device is used to achieve superior heat resistance, then the device can withstand high temperatures, but the metal lattice undergoes heat expansion and oxidation causing cracking, deformation, and non-uniform polarization characteristics
Solution Approach 1:
The patent uses a composite structure combining metal lattice with dielectric materials (oxide film and organic compound) to create a polarization device that maintains the heat resistance of metal while adding protective and functional properties. The oxide film layer prevents oxidation of the metal lattice, and the organic compound layer provides additional protection and uniformity, resolving the contradiction between heat resistance and polarization uniformity.
Solution Approach 2:
The oxide film acts as an intermediary layer between the metal lattice and the environment, preventing direct oxidation of the metal. This mediator layer protects the metal lattice from harmful oxidation while allowing the structure to maintain its heat resistance properties, thereby preserving polarization characteristic uniformity at high temperatures.
2Reliability
If the metal lattice is oxidized by heat treatment to improve environment resistance, then the polarization device has superior environment resistance, but the substrate undergoes cracking or deformation at temperatures of 500°C or higher
Solution Approach 1:
The oxide film is formed on the metal lattice before the final assembly and operation of the polarization device. This preliminary oxidation creates a protective layer that prevents further oxidation during high-temperature operation, allowing the device to withstand temperatures of 500°C or higher without substrate cracking or deformation.
Solution Approach 2:
The combination of metal lattice, oxide film, and organic compound creates a composite structure where each layer contributes specific properties. The oxide film provides environment resistance while the organic compound layer adds protection and uniformity, enabling the substrate to maintain integrity at high temperatures.
3Object-generated harmful factors
If a light absorbing layer is provided on a light reflecting layer to suppress reflectance, then the polarization device has reduced reflectance, but there is no oxidized film on the top face and side faces of the light reflecting layer
Solution Approach 1:
The patent creates a multi-layer composite structure where the metal lattice (light reflecting layer) is covered by an oxide film and an organic compound layer (light absorbing layer). This composite structure simultaneously achieves reflectance suppression through the organic compound layer and oxidation protection through the oxide film, resolving the contradiction between these two requirements.
Solution Approach 2:
The oxide film serves as an intermediary layer between the metal lattice and the organic compound layer. It provides oxidation protection to the metal while allowing the organic compound layer to effectively suppress reflectance, achieving both functions without interference.
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 effectively transmits TM waves while absorbing TE waves, maintaining polarization separation function and optical uniformity even under high temperatures, enhancing the reliability and performance of the polarization device.
Implementation Method 1
An optical absorption rate of the second dielectric layer is higher than that of the first dielectric layer
Implementation Method 2
ensuring uniform polarization characteristics across the surface... preventing metal layer oxidation
Implementation Method 3
maintaining polarization separation function... effectively transmits TM waves while absorbing TE waves
Data Source
AI summary
The wire grid type polarization device includes a substrate, and a metal layer formed on one face of the substrate in a substantially stripe shape in a plan view, a first dielectric layer provided on two side faces opposite to each other among a plurality of side faces of the metal layer and in a top part of the metal layer, and a second dielectric layer provided on the first dielectric layer. A substrate side end portion of the second dielectric layer is located between the one surface of the substrate and the top part of the first metal layer.The wire grid type polarization device includes a substrate and a plurality of metal layers that includes a first metal layer having a first side face, a second side face opposed to the first side face, and a top part. First and second dielectric layers are provided in the first side face, the second side face, and the top part of the first metal layer. The first dielectric layer is provided between the first metal layer and the second dielectric layer. The optical absorption rate of the first dielectric layer is less than that of the second dielectric layer.