Volume Hologram Photosensitive Composition with Composite Binder
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Solution Overview
Problem
Existing volume hologram recording technologies face challenges in achieving high brightness, heat resistance, and mechanical strength, with thermoplastic resin binder resins improving brightness but compromising heat resistance and mechanical strength, while heat curing resin binder resins maintain heat resistance but struggle with refractive index modulation and brightness.
Innovation Solution
A volume hologram photosensitive composition using a mixture of heat curing resin and thermoplastic resin at a predetermined mixing ratio as the binder resin, with the thermoplastic resin content ranging from 0 to 25% by weight, enhancing monomer diffusion migration and refractive index modulation without sacrificing heat resistance and mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If thermoplastic resin is used as binder resin, then hologram brightness is improved, but heat resistance and mechanical strength deteriorate
Solution Approach 1:
The patent uses a composite binder resin system combining thermoplastic resin (for brightness) and heat curing resin (for heat resistance and mechanical strength). This composite approach allows both contradictory requirements to be satisfied simultaneously by leveraging the advantageous properties of each material component.
2Reliability
If heat curing resin is used as binder resin, then heat resistance is maintained, but refractive index modulation and hologram brightness deteriorate
Solution Approach 1:
The patent combines heat curing resin (providing heat resistance) with thermoplastic resin (providing refractive index modulation capability) to create a composite binder system that achieves both heat resistance and high hologram brightness simultaneously.
3Illumination intensity
If large difference in refractive index between photopolymerizable monomer and binder resin is achieved, then hologram brightness is improved, but storage stability after hologram formation deteriorates
Solution Approach 1:
The patent optimizes the refractive index parameters of the binder resin composition to achieve an optimal balance. By carefully selecting and combining resin materials with specific refractive indices, the system achieves sufficient refractive index difference for high brightness while maintaining compositional stability for long-term storage.
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 achieves a hologram with excellent brightness, heat resistance, and mechanical strength, maintaining high diffraction efficiency even after heating, with a refractive index modulation level of not less than 0.04 and minimal reduction in diffraction efficiency at 120°C.
Implementation Method 1
upon interference exposure of a film of the photosensitive composition, photoradical polymerization is started in a high intensity light part
Implementation Method 2
leading to diffusion migration of the photoradically polymerizable monomer. As a result, sparse and dense parts of the photoradically polymerizable monomer are provided
Implementation Method 3
a sensitizing dye and utilizes the difference in refractive index between a photopolymerizable monomer and a binder resin
Data Source
AI summary
This invention provides a volume hologram photosensitive composition, which can realize a hologram having an excellent brightness and, at the same time, having excellent heat resistance and mechanical strength, and a photosensitive medium for volume hologram recording using the volume hologram photosensitive composition. The volume hologram photosensitive composition comprises at least a photopolymerizable monomer, a photopolymerization initiator, a sensitizing dye for sensitizing the initiator, and a binder resin. The binder resin comprises a heat curing resin, and optionally a thermoplastic resin, and the thermoplastic resin is contained in an amount of 0 to 25% by weight based on the total solid content of the photosensitive composition.