Diffractive Structures for Optical Data Storage
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Solution Overview
Problem
Existing optical recording media face challenges in reproducing distributed data encoding using focused-spot laser writers, as localized data marks are difficult to replicate, and standard methods are not effective for delocalized data marks.
Innovation Solution
The implementation of distributed diffractive structures on optical media, comprising sets of diffractive elements that modify the optical reading beam, allowing for delocalized data marks to be read and decoded, even when they are not physically present on the data layer, by mimicking the back-reflection of virtual data marks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If localized data marks are used on optical media, then data can be read with standard focused-spot laser writers, but distributed diffractive structures cannot be effectively reproduced or read
Solution Approach 1:
The patent creates virtual data marks by diffracting light from distributed structures to produce optical copies that mimic localized data marks. The diffractive elements generate reflected light patterns that are indistinguishable from those produced by physical data marks, enabling standard laser writers to read the encoded information without directly reproducing the physical mark structures.
Solution Approach 2:
The patent replaces physical mechanical data marks with optical diffractive structures that produce equivalent optical effects. Instead of using tangible localized marks that require precise physical reproduction, the system uses distributed diffractive elements that generate the necessary optical signals through light manipulation, substituting a mechanical reproduction problem with an optical solution.
2Reliability
If distributed diffractive structures are used for data encoding, then resistance to unauthorized reproduction increases, but readability with standard equipment decreases
Solution Approach 1:
The system generates optical copies of data marks through diffraction rather than physical copies. The distributed diffractive structures create virtual images that appear as localized data marks to standard readers, maintaining compatibility while preventing direct physical copying since the actual data encoding exists as distributed patterns rather than discrete reproducible marks.
Solution Approach 2:
The patent introduces diffractive optical elements as intermediaries between the stored data and the reading process. These elements mediate the interaction between light and data by transforming distributed physical patterns into localized optical images, allowing standard equipment to read data without directly interacting with the secure distributed structures.
3Reliability
If delocalized data marks are implemented, then security against copying improves, but the complexity of reading and decoding increases
Solution Approach 1:
The system creates virtual copies of data marks through optical diffraction rather than requiring complex decoding of distributed patterns. The diffractive structures naturally generate images that replicate the appearance and optical properties of localized data marks, allowing standard readers to interpret the data without complex processing while maintaining security through the distributed physical structure.
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 the successful reading and decoding of data encoded using delocalized diffractive structures, providing enhanced resistance to imperfections and unauthorized reproduction, while allowing for secure and efficient data storage and retrieval.
Implementation Method 1
distributed diffractive structures (i.e. sets of diffractive elements) are formed in or on an optical medium for encoding the data
Data Source
AI summary
An optical data storage medium comprises an optical medium with multiple data marks. Each data mark is arranged for modifying a portion of an optical reading beam incident thereon. At least one of the data marks is a delocalized data mark comprising a set of multiple diffractive elements collectively arranged for modifying a portion of the optical reading beam incident thereon. A method for recording data on an optical data storage medium comprises forming on or in the optical medium multiple data marks encoding the recorded data, including the at least one delocalized data mark. A method for reading an optical data storage medium comprises: successively illuminating with the optical reading beam the multiple data marks; sensing variations among the respective portions of the optical reading beam modified by the multiple data marks; and decoding from the sensed variations data encoded by the multiple data marks.