Non-Volatile Storage Medium with Aperiodic Dielectric Layers
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Solution Overview
Problem
Existing optical data storage methods struggle with accurate and reliable control of crystallization across layers, limiting high-density, durable, and efficient data storage, especially in harsh environments, and require improvements in material durability, handling, and manufacturing efficiency.
Innovation Solution
A data storage system with a stacked plurality of layers featuring aperiodic arrangements of different materials, utilizing non-linear absorption of electromagnetic beams to induce localized modifications in an information layer, allowing for precise and durable data storage with high density and efficient reading/writing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If periodic layer arrangements are used for optical data storage, then data storage density is improved, but control accuracy of crystallization across layers deteriorates
Solution Approach 1:
The patent applies asymmetry by replacing the periodic layer arrangement with an aperiodic arrangement where layer thicknesses vary randomly. This asymmetric structure prevents the formation of regular crystalline patterns across layers, making it easier to control and confine crystallization to specific target layers while maintaining high data storage density through the stacked multilayer configuration.
2Reliability
If conventional optical storage methods are used, then data storage is achieved, but durability in harsh environments deteriorates
Solution Approach 1:
The patent employs composite materials by stacking multiple dielectric layers with different materials (e.g., SiO2, Si3N4, TiO2, Al2O3) to create a multilayer structure. Each layer contributes different optical and mechanical properties, resulting in a composite structure that is both durable and resistant to harsh environmental conditions while enabling optical data storage functionality.
3Manufacturing precision
If aperiodic layer arrangements are used, then crystallization control is improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by varying the thickness parameters of individual layers in the aperiodic arrangement. By controlling the thickness of each dielectric layer differently (without following a periodic pattern), the patent achieves precise control over light interference and crystallization confinement, while the overall device structure remains manufacturable using standard thin-film deposition techniques.
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 system achieves high-density, durable data storage exceeding 100 years, resistant to harsh conditions, with efficient energy use and cost-effective manufacturing, enabling reliable and compact data handling.
Implementation Method 1
utilizing non-linear absorption of electromagnetic beams to induce localized modifications in an information layer
Implementation Method 2
pulsed lasers to induce crystallization and other modifications in sub-wavelength multilayer dielectric materials for the permanent storage of data
Data Source
AI summary
A data storage medium (2) comprising a stacked plurality of layers (9), each layer composed of a layer material selected from a group comprising at least two different dielectric materials, adjacent layers being formed of different materials, and at least one of the layers, that is not a top layer, constituting an information layer (9i) configured to be modified locally by energy from an electromagnetic beam (7) having a specific beam wavelength and a propagation direction (Z) transverse to the layers. The stacked plurality of layers include an aperiodic layer arrangement including at least three stacked adjacent layers having different thicknesses with respect to each other.