Wavelength-Encoded Nanostructures for High-Density Optical Storage
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Solution Overview
Problem
Current optical data storage technologies face limitations in achieving high density storage due to the binary coding system, with Blu-ray discs reaching capacity limits and near-field techniques requiring mechanical proximity that complicates disc removability.
Innovation Solution
The use of nanostructure arrangements on an optical data storage medium, where each data element is represented by a distinct wavelength reflected by metallic nanostructures, allowing for multiple states (e.g., 2, 4, 8, or 16) to be stored per pixel, using white light and hyperspectral CCD for reading, thereby increasing storage capacity without mechanical movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If binary coding system is used for optical data storage, then compatibility and simplicity are maintained, but data storage capacity is limited
Solution Approach 1:
The patent changes the fundamental parameter of data encoding from binary (2 states) to multi-state wavelength encoding. Each data element can represent multiple values (2, 4, 8, or 16 states) by reflecting different wavelengths of light, thereby increasing storage capacity without requiring more physical space. This is achieved by varying the optical properties (wavelength reflection) of the storage medium rather than using binary presence/absence encoding.
2Quantity of substance
If near-field techniques are used to reduce spot size, then data density is improved, but mechanical proximity requirements increase
Solution Approach 1:
The patent replaces the mechanical near-field positioning system with an optical far-field detection system. Instead of requiring the read head to be within 10-25 nm of the disc surface, the invention uses wavelength-selective optical detection that can operate from a distance. The nanostructure arrangements reflect different wavelengths that can be detected by a hyperspectral CCD without requiring mechanical proximity, thus maintaining high data density while enabling disc removability.
3Quantity of substance
If multiple wavelengths are used per data element, then storage capacity increases, but measurement and detection difficulty increases
Solution Approach 1:
The patent employs a hyperspectral CCD detector that serves multiple functions simultaneously: it captures the entire spectral range, resolves individual wavelengths, and maps each wavelength to a specific data value. This universal detector handles all wavelength measurements in a single operation, making the multi-wavelength detection system as efficient as binary detection while enabling multi-state encoding. The detector's ability to simultaneously measure multiple wavelengths without requiring separate measurement systems resolves the detection complexity issue.
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
This approach enables a significant increase in data storage capacity, potentially up to 500 GB on a single disc, with minimal mechanical movement and faster data acquisition, by leveraging plasmonic resonance to encode multiple states within a small area, surpassing the limitations of binary systems.
Implementation Method 1
forming, for each data element, a nanostructure arrangement on the optical data storage medium, the nanostructure arrangement configured to reflect light of the wavelength associated with the value of the data element in response to a light irradiated on the optical data storage medium
Data Source
AI summary
According to embodiments of the present invention, a method of writing to an optical data storage medium is provided. The method includes receiving a plurality of data elements, each data element having one of a plurality of values, wherein each value of the plurality of values is associated with a wavelength, and forming, for each data element, a nanostructure arrangement on the optical data storage medium, the nanostructure arrangement configured to reflect light of the wavelength associated with the value of the data element in response to a light irradiated on the optical data storage medium. According to further embodiments of the present invention, a method of reading from an optical data storage medium and an optical data storage medium are also provided.