Holographic Data Storage Using Groove Diffracted Light
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Solution Overview
Problem
Conventional holographic data storage systems face challenges in providing a simple, inexpensive, and robust bit-oriented memory solution with high capacity and tolerance to misalignment and temperature fluctuations, as they require precise alignment and are sensitive to environmental conditions.
Innovation Solution
A data storage device utilizing a substrate with oppositely disposed surfaces and micro-holograms arranged in volumes, where the presence or absence of micro-holograms in stacked layers indicates data, using a non-linearly responsive medium that undergoes refractive index changes with threshold energy, allowing for dense data storage and improved tolerance to misalignment and temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional holographic memory systems use page-based parallel data writing, then data storage capacity can be achieved, but system complexity and sensitivity to misalignment increase
Solution Approach 1:
The patent segments data into individual bits stored as separate micro-holograms in volumetric layers, rather than writing entire pages in parallel. Each micro-hologram represents a single bit, allowing sequential writing and reading operations that reduce system complexity while maintaining high storage capacity through volumetric stacking.
Solution Approach 2:
The patent transitions from conventional 2D page-based holographic storage to 3D volumetric storage by arranging micro-holograms in stacked layers along the depth dimension. This dimensional change enables high-capacity bit-oriented storage while simplifying the writing process to sequential single-bit operations rather than complex parallel page writing.
2Measurement precision
If conventional holographic systems use precise alignment requirements, then data storage accuracy is maintained, but tolerance to misalignment and environmental conditions deteriorates
Solution Approach 1:
The patent utilizes non-linear optical materials with threshold response characteristics, where the refractive index changes only when a threshold energy level is exceeded. This parameter change approach allows the system to tolerate misalignment and environmental variations while maintaining accurate data storage, as the threshold mechanism provides inherent robustness against minor deviations.
Solution Approach 2:
The patent employs materials that undergo phase transitions or non-linear optical responses when exposed to threshold energy levels. This phase transition mechanism enables the system to distinguish between valid data (above threshold) and noise or misalignment (below threshold), thereby improving reliability and tolerance to environmental conditions while maintaining storage accuracy.
3Ease of operation
If conventional holographic systems use linear optical response, then data retrieval is straightforward, but sensitivity to temperature fluctuations and environmental conditions increases
Solution Approach 1:
The patent employs non-linear optical materials whose response characteristics change with energy input. Below a threshold energy level, the material exhibits a stable, linear response suitable for straightforward data retrieval. Above the threshold, the material undergoes a phase transition or non-linear response that enables robust data storage while maintaining ease of operation through simple threshold-based read/write mechanisms that are less sensitive to temperature variations.
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 a robust, cost-effective bit-oriented holographic memory system with improved tolerance to misalignment and temperature fluctuations, allowing for high-density data storage and efficient data retrieval.
Implementation Method 1
at least one groove in at least one of the surfaces and being operative to diffract light through the at least one surface and into the volumes
Implementation Method 2
This interference pattern causes a change or modulation of the refractive index of the holographic medium
Implementation Method 3
using a non-linearly responsive medium that undergoes refractive index changes with threshold energy
Data Source
AI summary
A data storage device comprises a substrate having oppositely disposed surfaces and a plurality of volumes arranged along tracks between the surfaces; a plurality of micro-holograms each contained in a corresponding one of the volumes; and, at least one groove in at least one of the surfaces and being operative to diffract light through the at least one surface and into the volumes; wherein, the presence or absence of a micro-hologram in a stacked layer in each of the volumes is indicative of a corresponding portion of data stored.