Holography Device Reversible Phase Change Grating
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Solution Overview
Problem
Current holography devices using photopolymers can only record a single hologram as the hardened thickness difference is irreversible, limiting their ability to record or delete images.
Innovation Solution
A holography device with a light reaction layer that forms and removes diffraction gratings using spatially uniform and non-uniform light, allowing for the recording and erasure of holograms by varying the volume of the light reaction layer, which is made of materials like ZnO doped with Er or photorefractive crystals, and includes a metal thin film and buffer layer to diffract surface plasmons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a photopolymer is used to form diffraction gratings in a holography device, then a holography image can be recorded, but the hardened thickness difference becomes irreversible and only a single holography image can be reproduced
Solution Approach 1:
The patent changes the physical state of the light reaction layer by using phase change materials (such as GST: Ge2Sb2Te5) that can reversibly transition between crystalline and amorphous states. This allows the diffraction grating to be formed, erased, and reformed multiple times, enabling the recording of multiple holography images without permanent hardening of the photopolymer structure.
2Manufacturing precision
If a photopolymer is hardened by receiving light, then a diffraction grating is formed for holography image recording, but the current state cannot be changed again
Solution Approach 1:
The patent utilizes phase transitions of the light reaction layer material between crystalline and amorphous states. When the material transitions to the crystalline state, a diffraction grating is formed with high precision. When heated above the phase change temperature, the material transitions to an amorphous state, erasing the diffraction grating. This reversible phase transition enables multiple cycles of holography image recording and erasure while maintaining manufacturing precision.
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
Enables the recording and deletion of multiple holograms, allowing for dynamic image display and moving pictures, as the diffraction grating can be formed and removed, enhancing the functionality of holography devices.
Implementation Method 1
a light reaction layer configured to react with light so as to form and remove a diffraction grating
Implementation Method 2
surface plasmon formed on the metal thin film may be diffracted so as to output a holography image
Data Source
AI summary
A holography device may include a light reaction layer configured to react with light to form and remove a diffraction grating, and a metal thin film on the light reaction layer. When first light is incident on the metal thin film while the grating is formed in the light reaction layer, surface plasmon formed on the metal thin film may be diffracted so as to output a holography image. A method of processing a holography image may include recording the image on a holography device by irradiating first light to a light reaction layer to form a diffraction grating, outputting the image by irradiating second light to a metal thin film on the light reaction layer to diffract surface plasmon formed on the metal thin film, and deleting the image from the holography device by irradiating third light to the light reaction layer to remove the grating.