Optical Data Storage Medium Triarylmethane Sensitizer Holographic Efficiency
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Solution Overview
Problem
Conventional optical data storage media face limitations in achieving high-density bit-wise holographic data storage due to lack of nonlinear response to recording light intensity, leading to substantial degradation of hologram efficiency at various depths and refractive index changes.
Innovation Solution
An optical data storage medium comprising a polymer matrix, a reactant capable of undergoing triplet excitation, and a nonlinear sensitizer such as triarylmethane dye that absorbs actinic radiation to cause upper triplet energy transfer, achieving a refractive index change capacity of at least 0.005, facilitating high-density microholographic data storage with improved diffraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional optical data storage media are used, then data storage is achievable, but the storage density is limited and hologram efficiency degrades at various depths
Solution Approach 1:
The patent applies parameter changes by modifying the refractive index of the storage medium through photochemical reactions. The medium undergoes controlled changes in refractive index (from 1.4 to 1.6 range) in response to recording light intensity, enabling high-density bit-wise holographic storage while maintaining hologram efficiency across various depths. This parameter transformation allows the medium to differentiate between recorded and unre corded regions effectively.
Solution Approach 2:
The patent employs composite materials by combining multiple components in the storage medium including photochromic compounds, polymers, and other functional materials. This composite structure enables the medium to exhibit both nonlinear optical response for high-density storage and maintained hologram efficiency at various depths, resolving the contradiction between storage capacity and reliability.
2Quantity of substance
If nonlinear response to recording light intensity is achieved, then high-density bit-wise holographic storage is enabled, but the complexity of the medium increases
Solution Approach 1:
The patent achieves nonlinear response through parameter changes in the photochromic compounds' optical properties. These compounds exhibit threshold-like behavior where refractive index changes only above certain light intensity thresholds, enabling bit-wise storage without requiring complex multi-layer structures. The parameter transformation occurs naturally through the photochemical properties of the materials.
Solution Approach 2:
The patent uses photochromic compounds as intermediary materials that mediate between recording light and the storage medium. These compounds absorb actinic radiation and transfer energy to cause refractive index changes, simplifying the overall system by providing a direct photochemical pathway without complex mechanical or electronic control mechanisms.
3Quantity of substance
If refractive index change capacity is increased to support high diffraction efficiency, then data density improves, but hologram efficiency degrades at various depths
Solution Approach 1:
The patent optimizes refractive index parameter changes to occur progressively through the medium depth. By controlling the magnitude and distribution of refractive index changes (delta n values), the medium maintains high diffraction efficiency for stored holograms while enabling high data density. The parameter changes are tuned to ensure uniform response across various depths.
Solution Approach 2:
The patent applies local quality by creating spatially varying refractive index changes throughout the medium. Different regions at various depths exhibit optimized local refractive index properties that maintain hologram efficiency while supporting high overall data density. This local optimization ensures that holograms stored at any depth maintain their efficiency.
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-density microholographic data storage with enhanced diffraction efficiency and stability, allowing for increased storage capacity while maintaining refractive index changes only at the focal point, reducing microhologram size and minimizing data degradation.
Implementation Method 1
a non-linear sensitizer capable of absorbing actinic radiation to cause upper triplet energy transfer to said reactant
Implementation Method 2
capable of absorbing actinic radiation to cause upper triplet energy transfer to said reactant
Implementation Method 3
a reactant capable of undergoing a change upon triplet excitation
Implementation Method 4
thereby causing a refractive index change; and a non-linear sensitizer capable of absorbing actinic radiation to cause upper triplet energy transfer to said reactant. The refractive index change capacity of the medium is at least about 0.005
Implementation Method 5
bit-wise approach, where each bit (or few bits) of information is represented by a hologram localized to a microscopic volume within a medium to create a region that reflects the readout light
Implementation Method 6
The magnitude of the refractive index modulations produced in the material by the recording light defines the diffraction efficiency for a given system configuration
Data Source
AI summary
An optical data storage medium is provided. The optical data storage medium includes a polymer matrix; a reactant capable of undergoing a change upon triplet excitation, thereby causing a refractive index change; and a non-linear sensitizer capable of absorbing actinic radiation to cause upper triplet energy transfer to said reactant. The refractive index change capacity of the medium is at least about 0.005. The non-linear sensitizer comprises a triarylmethane dye.