FeSi Inorganic Polarizing Plate for Broadband Reflectance Reduction

Solution Overview

Problem

Inorganic polarizing plates face challenges in achieving a desired extinction ratio and reducing reflectance across a wide range of wavelengths, particularly due to material limitations and the need for specific particle selection and film thickness optimization.

Innovation Solution

An inorganic polarizing plate structure featuring a transparent substrate with a reflective grid layer, a dielectric layer, and an absorbing layer composed of FeSi fine particles, which provides a resonance absorption effect by leveraging optical anisotropy in the FeSi fine particles, thereby achieving a desired extinction ratio and reduced reflectance across a broader wavelength range.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If inorganic fine particles are used in the absorbing layer, then heat resistance and durability are improved, but reflectance increases and extinction ratio varies depending on particle material

Engineering Contradiction:

Improveheat resistanceVSAvoidreflectance

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent uses FeSi alloy fine particles as a composite material combining iron and silicon in specific ratios (1-33 mol% Fe). This composite structure leverages the plasmon resonance characteristics of iron while silicon suppresses unwanted reflections, achieving both high heat resistance and low reflectance across broad wavelength ranges.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent systematically varies the composition ratio of FeSi alloy (1-33 mol% Fe) and controls particle size (1-100 nm) to optimize optical properties. By changing these parameters, the absorbing layer achieves desired extinction ratios while maintaining low reflectance across different wavelength bandwidths.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If inorganic fine particles are used in the absorbing layer, then heat resistance is improved, but extinction ratio optimization becomes more difficult due to material selection constraints

Engineering Contradiction:

Improveheat resistanceVSAvoidmaterial selection complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent employs FeSi alloy fine particles as a composite material combining iron and silicon in specific ratios (1-33 mol% Fe). This composite structure leverages the plasmon resonance characteristics of iron while silicon suppresses unwanted reflections, achieving both high heat resistance and low reflectance across broad wavelength ranges.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent systematically varies the composition ratio of FeSi alloy (1-33 mol% Fe) and controls particle size (1-100 nm) to optimize optical properties. By changing these parameters, the absorbing layer achieves desired extinction ratios while maintaining low reflectance across different wavelength bandwidths.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If a single-layer absorbing layer is used, then device complexity is reduced, but achieving desired extinction ratio and low reflectance across wide wavelength range becomes difficult

Engineering Contradiction:

Improvelayer structure complexityVSAvoidreflectance reduction across wavelength range

Core Design Contradiction:

Device complexityVSObject-generated harmful factors

Solution Approach 1:

The patent employs FeSi alloy fine particles as a composite material combining iron and silicon in specific ratios (1-33 mol% Fe). This composite structure leverages the plasmon resonance characteristics of iron while silicon suppresses unwanted reflections, achieving both high heat resistance and low reflectance across broad wavelength ranges.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent systematically varies the composition ratio of FeSi alloy (1-33 mol% Fe) and controls particle size (1-100 nm) to optimize optical properties. By changing these parameters, the absorbing layer achieves desired extinction ratios while maintaining low reflectance across different wavelength bandwidths.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9678261B2Inorganic polarizing plate containing FeSi having 1 to 33 mol% Fe

Publication Date: 2017.06.13 DEXERIALS CORP

AI summary

To provide an inorganic polarizing plate which, when used in structures having different used wavelength bands, can reduce reflectance by using a common structure, making it possible to achieve a predetermined light extinction ratio. The inorganic polarizing plate has a substrate that is transparent to light in a used bandwidth, a reflective layer that is composed of grids that are formed on one surface of the substrate with a pitch that is smaller than a wavelength of light in the used bandwidth, a dielectric layer that is stacked on the reflective layer, and an absorbing layer containing FeSi fine particles.