Holographic Storage Material Three-Layer Optical Structure
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Solution Overview
Problem
Holographic storage materials face limitations in achieving optimal optical properties, such as absorption, reflection, and transmission, due to the thickness of the metallic layer affecting radiation absorption and the need for high laser power, which is costly or limited, and the difficulty in producing embossed holograms with complex production processes.
Innovation Solution
A three-layer structure comprising a polymer film with a metallic first layer, a non-metallic second layer, and a metallic third layer, where the total thickness is less than the wavelength of the radiation used, allowing for targeted adjustment of optical properties and improved absorption and reflection characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the metallic layer thickness is increased to improve absorption properties, then absorption increases, but reflection decreases and laser power requirements increase
Solution Approach 1:
The single metallic layer is segmented into multiple metallic layers separated by non-metallic layers. This segmentation allows each metallic layer to contribute to absorption while the non-metallic layers maintain optical density and reduce scattered light, achieving high absorption without proportionally increasing laser power requirements
Solution Approach 2:
The storage material uses a composite structure combining metallic layers (for absorption) with non-metallic layers (for optical density and scattered light reduction). This composite approach optimizes the balance between absorption, reflection, and laser power requirements by leveraging the complementary properties of different materials
2Use of energy by moving object
If the metallic layer thickness is increased to improve optical density, then optical density increases, but absorption decreases and laser power requirements increase
Solution Approach 1:
The optical density function is segmented from the absorption function. Non-metallic layers provide optical density and scattered light reduction, while metallic layers provide absorption. This segmentation allows optimization of each function independently without compromising the other
Solution Approach 2:
The composite structure combines non-metallic materials (for optical density) with metallic materials (for absorption). This composite approach achieves high optical density without the penalty of increased laser power requirements that would result from using thicker single metallic layers
3Use of energy by moving object
If a single metallic layer is used to achieve sufficient absorption, then absorption is adequate, but optical density and scattered light control are limited
Solution Approach 1:
The single metallic layer is segmented into multiple metallic layers with non-metallic layers in between. This segmentation allows the non-metallic layers to specifically address scattered light control and optical density enhancement without compromising the absorption capability provided by the metallic layers
Solution Approach 2:
The composite structure combines metallic layers (for absorption) with non-metallic layers (for scattered light control and optical density). This composite approach overcomes the limitations of single-layer structures by leveraging the complementary properties of different materials to simultaneously optimize absorption and reduce harmful scattered light effects
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 three-layer structure enables flexible adjustment of optical properties, achieving high absorption and optical density with reduced laser power requirements and minimizing scattered light effects, allowing for efficient writing and reading of holograms with improved reflective and diffractive structures.
Implementation Method 1
The metallic layer has a significant influence on the optical properties, in particular the absorption properties of the storage material
Implementation Method 2
In addition to the absorption properties, however, transmission and reflection also play a role in the properties of the storage material
Implementation Method 3
the structure of which can be selectively influenced by introducing thermal energy, preferably by means of a focused laser beam
Implementation Method 4
The resolution of the resulting matrix of points can be in the range below 1 μm. Thus, holograms can be written with a high resolution in a small space, the information from which can only be read out by illuminating them with a light beam and reconstructing the diffraction image
Data Source
Figure 1~3
AI summary
The invention relates to holographic storage material (1) comprising at least one polymer film (3) and one metallic first layer (4) which is applied to the polymer film (3). In order to provide a storage material (1) having improved optical properties, a non-metallic second layer (5) and a metallic third layer (6) are provided. The second layer (5) is arranged between the first (4) and the third (6) layers. The total thickness of the first, second and third layers (4, 5, 6) is less than the wavelength of the radiation used for reading out.