Subwavelength Nano-Grating Optical Data Storage
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Solution Overview
Problem
Current optical storage media, such as CDs and DVDs, face limitations in storage capacity and data transfer rates, with a need for increased capacity while maintaining compatibility with existing systems and cost-effectiveness, and the ability to read information at higher rates.
Innovation Solution
The use of subwavelength nano-grating structures that alter light properties like phase, polarization, and wavelength to encode data in a massively multi-level format, allowing for higher data density and transfer rates, achieved through the fabrication of nanostructures that are smaller than the wavelength of light, and detection systems like the Wollaston prism for phase retardation measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If subwavelength nano-grating structures are used to encode data, then storage capacity increases significantly, but manufacturing precision requirements become much stricter
Solution Approach 1:
The patent changes the physical parameters of the storage medium by using subwavelength nano-grating structures with specific geometric parameters (feature sizes smaller than the wavelength of light). This allows encoding multiple bits per physical location by varying grating parameters such as orientation, period, and depth, thereby increasing storage capacity while the parameters themselves are controlled through precise fabrication processes
Solution Approach 2:
The patent introduces additional encoding dimensions beyond simple presence/absence of marks. By using nano-grating structures where data can be encoded in the orientation, period, depth, and combination of multiple gratings, the system adds dimensional complexity to the storage medium. This allows terabyte-capacity discs to be read with existing optical drives by encoding data in multiple physical dimensions of the nanostructures
2Quantity of substance
If multi-level encoding format is used, then data density increases, but detection and measurement complexity increases
Solution Approach 1:
The patent uses an intermediary optical system comprising polarizers and wave plates to convert the complex multi-level phase information encoded in the nano-gratings into simplified intensity variations that can be easily detected by standard photodetectors. This intermediary optical train translates the hard-to-measure phase retardation into straightforward intensity measurements, enabling high-density data retrieval without requiring complex detection equipment
Solution Approach 2:
The patent creates optical copies of the encoded information through multiple reading passes at different orientations. By reading the same physical location multiple times with the disc rotated to different angles, the system reconstructs the multi-level data through computational processing of these copies, effectively simplifying the detection process through redundant measurement
3Productivity
If higher data transfer rates are achieved, then productivity increases, but device complexity increases
Solution Approach 1:
The patent designs the optical detection system to be universal and multi-functional, using the same optical train (laser, polarizers, wave plates, photodetectors) for both reading and writing operations, and for detecting multiple different data levels. This multi-functional approach increases productivity by enabling high-speed data retrieval without requiring separate specialized systems for each function, thereby avoiding proportional increases in device complexity
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 storage capacity and data transfer rates, with the potential for terabyte-range capacities on low-cost discs, while maintaining compatibility with existing optical drives and reducing costs.
Implementation Method 1
The optical data element alters one or more properties of the light such as reflected amplitude, polarization, phase, wavelength, and spatial orientation to encode data
Implementation Method 2
The optical data element alters one or more properties of the light such as reflected amplitude, polarization, phase, wavelength, and spatial orientation
Implementation Method 3
Massively multi-level optical data storage using subwavelength sized nano-grating structures
Implementation Method 4
detection systems like the Wollaston prism for phase retardation measurement
Data Source
AI summary
An information storage apparatus uses an optical data element (nano-grating) with features that are smaller than the wavelength of light. The optical data element alters one or more properties of the light such as reflected amplitude, polarization, phase, wavelength, and spatial orientation to encode data in a massively multi-level format.