Multilayer Optical Storage Medium with Buffer Layers
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Solution Overview
Problem
Current optical information storage technologies face limitations in achieving high areal information capacity and three-dimensional data storage, with multilayer storage methods being difficult to scale economically and holographic storage requiring complex and costly hardware.
Innovation Solution
A multilayer optical information storage medium is developed using a polymer extrusion process, comprising alternating active data storage layers and buffer layers, allowing for three-dimensional data storage compatible with existing optical read/write technology, with active layers undergoing optically induced changes in properties for data storage and retrieval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multilayer physical storage is employed, then information capacity is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The storage medium is divided into multiple thin active data storage layers separated by buffer layers, with each layer being writable and readable independently. This segmentation enables three-dimensional data storage while maintaining manufacturing feasibility through a scalable extrusion process that can produce the multilayer structure in a single continuous operation.
Solution Approach 2:
The invention transitions from two-dimensional surface storage to three-dimensional volumetric storage by creating multiple stacked active layers at different depths within the medium. This dimensional expansion significantly increases information capacity while the extrusion manufacturing process provides a cost-effective method to produce the complex multilayer structure.
2Quantity of substance
If holographic storage is used, then information capacity is improved, but hardware complexity and cost increase
Solution Approach 1:
The invention replaces the complex optical hardware required for holographic storage with a simpler physical multilayer structure that can be read and written using conventional optical methods. Each active layer can be independently accessed using standard optical focusing techniques, eliminating the need for sophisticated holographic read/write systems while maintaining high information capacity.
3Quantity of substance
If layer thickness is reduced for higher density, then storage density is improved, but signal-to-noise ratio deteriorates
Solution Approach 1:
Buffer layers are introduced as intermediary structures between active data storage layers. These buffer layers provide optical isolation that reduces interlayer cross-talk and parasitic absorption, thereby improving the signal-to-noise ratio for each active layer. The buffer layers act as mediators that prevent harmful optical interactions while maintaining the thin-layer high-density structure.
Solution Approach 2:
The multilayer structure provides localized optical environments for each active layer, with buffer layers creating distinct optical zones that confine reading and writing operations to specific layers. This local quality control reduces aberrations and cross-talk, maintaining high signal-to-noise ratios even as overall storage density increases through additional layers.
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 enables high signal-to-noise ratio and reduced interlayer cross-talk, allowing for precise data location and increased storage density, while being compatible with existing technology and scalable at low cost.
Implementation Method 1
The active data storage layers can include a material that undergoes an optically induced localized change of optical properties when written by the appropriate permanent or reversible one- or multiphoton, linear, non-linear or threshold optical writing process.
Implementation Method 2
The active data storage layers can include a material that undergoes an optically induced localized change of optical properties when written by the appropriate permanent or reversible one- or multiphoton, linear, non-linear or threshold optical writing process.
Implementation Method 3
The fluorescent dye can be reversible by exposure to light between a first condition exhibiting a first fluorescence and a second condition exhibiting a second fluorescence different from the first fluorescence.
Data Source
AI summary
An optical information storage medium includes a multilayer film that includes a plurality of extruded alternating active data storage layers and buffer layers, which separate the active data storage layers. The active data storage layers and buffer layers have thicknesses that allow the active data storage layers to be writable by non-linear or threshold writing processes to define data voxels within the active data storage layers that are readable by an optical reading device.