Hydrogel 3D Optical Storage via Laser Patterning and Dehydration
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Solution Overview
Problem
Current 3D optical storage technologies face limitations in storage density, writing and reading speeds, and data security due to the optical diffraction limit, slow write-in speeds, and the inability to encrypt data directly, leading to potential security compromises.
Innovation Solution
The method involves patterning a hydrogel using a laser to write data, then shrinking it to encrypt and store the data, achieving high storage density and speed by utilizing a hydrogel substrate that can be expanded for reading, allowing for secure and efficient data storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If data is stored using conventional optical storage methods, then storage capacity is limited by the optical diffraction limit, but achieving higher storage density requires overcoming this fundamental physical limitation
Solution Approach 1:
The patent transitions from 2D planar optical storage to 3D volumetric storage by utilizing the third dimension (depth) within the storage medium. This is achieved through two-photon polymerization that creates 3D nanopatterns throughout the volume of the resin layer, allowing data to be stored in multiple layers and significantly increasing storage density beyond the optical diffraction limit
Solution Approach 2:
The patent changes the physical and chemical parameters of the storage medium by using a photopolymerizable resin with specific properties (refractive index matching, transparency to laser wavelengths). The resolution is enhanced by adjusting process parameters including laser wavelength, pulse duration, numerical aperture, and resin composition to achieve sub-diffraction limit feature sizes
2Quantity of substance
If high storage density is achieved through 3D optical storage, then storage capacity increases, but writing and reading speeds become slow due to sequential processing requirements
Solution Approach 1:
The patent performs preliminary actions by pre-aligning the objective lens and storage medium, pre-focusing the laser beam, and having the galvanometer mirrors and piezoelectric actuators ready in their initial positions. This allows the writing process to begin immediately without time-consuming setup, enabling high-speed sequential writing of 3D patterns
Solution Approach 2:
The patent achieves continuous useful action through high-repetition-rate pulsed laser operation combined with continuous scanning of the beam through galvanometer mirrors and piezoelectric stage movement. The laser fires pulses in rapid succession as the beam continuously traces the 3D pattern, eliminating idle time between writing operations and maintaining high productivity throughout the storage process
3Ease of operation
If conventional optical storage methods are used, then data can be read directly, but data security is compromised due to inability to encrypt
Solution Approach 1:
The patent segments the stored data into multiple encrypted portions distributed throughout the 3D volume of the storage medium. Each plane or region contains encrypted data segments that require specific decryption keys or sequences to access, preventing unauthorized reading even if the physical medium is obtained
Solution Approach 2:
The patent introduces an intermediary encryption layer between the stored data and the reading process. Decryption keys or authentication sequences must be provided to the reading system before data can be retrieved, acting as a security gate that maintains both security and ease of authorized operation
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 significantly enhances storage density beyond the optical diffraction limit, achieves high writing and reading speeds, and ensures data security through physical encryption, while maintaining chemical stability for long-term storage.
Implementation Method 1
patterning a hydrogel by illuminating a laser on the hydrogel
Implementation Method 2
shrinking the patterned hydrogel to encrypt and store the data
Data Source
AI summary
In this application, a 2D or 3D optical storage and a physical encryption method with ultrahigh storage density are presented. Designed information patterns can be written in an expanded hydrogel via laser patterning, followed by volume shrinkage and dehydration of the hydrogel to achieve physical encryption, ultrahigh storage density, and long-term storage. For decryption, the dehydrated gel is re-expanded, and then immersed in a solution of fluorescent materials to retrieve the stored information via an imaging system.