Photopolymer Composition Silane Crosslinking Refractive Index Modulation
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Solution Overview
Problem
Existing photopolymer compositions for hologram production face challenges in achieving high refractive index modulation while maintaining thin thickness and durability against temperature and humidity variations.
Innovation Solution
A novel photopolymer composition incorporating a specific dye compound and a silane-based (meth)acrylate polymer with optimized crosslinking density, utilizing a silane crosslinking agent and a photoreactive monomer to enhance refractive index modulation and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the thickness of the photopolymer layer is reduced to achieve angular selectivity, then the angular selectivity increases, but the refractive index modulation value decreases
Solution Approach 1:
The patent changes the chemical composition parameters of the photopolymer layer by introducing a silane-based (meth)acrylate polymer with specific molecular weight (10,000-100,000) and silane crosslinking agents. This compositional parameter change enables the layer to achieve both thin thickness (5-30 μm) for angular selectivity and sufficient refractive index modulation (Δn ≥ 0.020) for diffraction efficiency.
Solution Approach 2:
The patent creates a composite photopolymer system combining silane-based (meth)acrylate polymer, silane crosslinking agent, and photoreactive monomer. This composite material structure provides enhanced refractive index modulation capability while maintaining thin layer thickness, resolving the contradiction between angular selectivity and diffraction efficiency.
2Manufacturing precision
If the refractive index modulation is increased to improve diffraction efficiency, then the diffraction efficiency increases, but the thickness of the photopolymer layer increases
Solution Approach 1:
The patent modifies the material parameters by using silane-based (meth)acrylate polymer with controlled molecular weight (10,000-100,000) and incorporating silane crosslinking agents. These parameter changes enable achieving high refractive index modulation (Δn ≥ 0.020) in thin layers (5-30 μm), eliminating the need for thick layers to achieve sufficient diffraction efficiency.
3Ease of manufacture
If conventional photopolymer compositions are used to simplify manufacturing, then the ease of manufacture is improved, but the durability against temperature and humidity deteriorates
Solution Approach 1:
The patent develops a composite photopolymer composition containing silane-based (meth)acrylate polymer, silane crosslinking agent, and photoreactive monomer. The silane crosslinking creates a three-dimensional network structure that provides exceptional durability against temperature and humidity variations while maintaining manufacturing feasibility through standard photopolymerization processes.
Solution Approach 2:
The patent changes the chemical structure parameters by introducing silane functional groups that form crosslinked networks. This structural parameter change fundamentally improves the thermal and moisture stability of the photopolymer layer without complicating the manufacturing process, as the crosslinking occurs automatically during photopolymerization.
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 composition achieves high refractive index modulation and improved durability, maintaining performance even at thin thicknesses and under varying environmental conditions.
Implementation Method 1
the photosensitive film produced from such a composition is irradiated with laser interference light to induce photopolymerization of local monomers
Implementation Method 2
utilizing a silane crosslinking agent and a photoreactive monomer to enhance refractive index modulation and durability
Data Source
AI summary
The present invention relates to a compound having a novel structure, a photopolymer composition including the compound as a dye, a hologram recording medium produced from the photopolymer composition, an optical element including the hologram recording medium, and a holographic recording method using the hologram recording medium.