Optical Data Storage Media Using Platinum Ethynyl Complexes
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Solution Overview
Problem
Conventional optical data storage media face limitations in storage density, requiring high optical power for 3D recording, linear response to light, and sensitivity to light-induced data loss, especially in holographic storage which is prone to temperature, wavelength, and vibration fluctuations.
Innovation Solution
A composition comprising a reactant capable of triplet excitation and a non-linear sensitizer, such as platinum ethynyl complexes, that absorbs actinic radiation at 405 nm for upper triplet-to-triplet energy transfer, enabling a threshold response to recording light and minimizing refractive index changes in the surrounding medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional 3D recording methods are used to increase storage capacity by recording depth-wise, then storage capacity is improved, but recording rate becomes slow and large optical power is required
Solution Approach 1:
The patent changes the optical response parameter of the medium from linear to non-linear (threshold-type) by using a photosensitive medium that exhibits non-linear optical absorption. This allows the medium to respond strongly only above a threshold optical power, enabling efficient depth-wise recording with reduced optical power requirements and improved recording rate while maintaining high storage capacity.
Solution Approach 2:
The patent employs a threshold-type photosensitive medium that undergoes irreversible photoreaction above a threshold optical power. This disposable-like approach where the medium responds decisively above threshold and remains stable below it enables high-speed recording without the need for complex reversible mechanisms, improving productivity while maintaining storage capacity.
2Quantity of substance
If conventional optical data storage media are used, then data can be stored optically, but storage density is limited by physical constraints on minimum bit size
Solution Approach 1:
The patent transitions from 2D surface recording to 3D depth-wise recording by utilizing the threshold-type photoreaction that occurs only above a threshold optical power. This enables data to be recorded at different depths within the medium, effectively adding a third dimension (depth) to the storage space, thereby increasing storage density without reducing the minimum bit size on each layer.
3Ease of manufacture
If linear response media are used for optical recording, then data can be recorded, but the medium requires mechanisms to eliminate sensitivity to light after recording to prevent unintended erasure
Solution Approach 1:
The patent converts the potential harm of light sensitivity into a benefit by using a threshold-type response where the medium is insensitive to low-level light (including ambient light and readout beams) and responds only above a threshold optical power. This eliminates the need for additional mechanisms to prevent unintended erasure, improving both manufacturing simplicity and data stability.
4Quantity of substance
If holographic storage is used to increase storage capacity, then more data can be stored, but the system becomes sensitive to temperature, wavelength, and vibration fluctuations
Solution Approach 1:
The patent changes the optical response parameter from linear to non-linear (threshold-type), which fundamentally alters how the medium interacts with recording light. The threshold-type response creates a more robust system that is less sensitive to environmental fluctuations such as temperature, wavelength, and vibration, while still enabling high-capacity holographic storage through depth-wise recording.
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 solution enhances data storage capacity by allowing localized, high-density microhologram recording with reduced unintended data alteration, improved robustness to environmental variations, and efficient energy transfer, leading to increased storage density and stability.
Implementation Method 1
a non-linear sensitizer, such as platinum ethynyl complexes, that absorbs actinic radiation at 405 nm
Implementation Method 2
capable of absorbing actinic radiation at 405 nm to cause upper triplet-to-triplet energy transfer
Implementation Method 3
many RSAs experience photoexcitation when impinged upon by incident actinic radiation having a wavelength of 532 nm
Implementation Method 4
reverse saturable absorbers (RSA) are compounds that have extremely low linear absorption at a given wavelength, and transmit nearly all of the light at this wavelength. However, when subjected to high intensity laser power at these given wavelengths, low level linear absorption can lead to a state where the molecule has a higher absorption cross section and becomes highly absorbing at that same wavelength
Implementation Method 5
the superposition of a reference beam and a signal beam, containing digitally encoded data, forms a 3-D interference pattern within the volume of the medium resulting in a chemical reaction that changes or modulates the refractive index of the photosensitive medium
Implementation Method 6
Holographic storage is optical data storage in which the data is represented as holograms, which are images of three dimensional interference patterns created by the intersection of two beams of light in a photosensitive medium
Implementation Method 7
The hologram can later be retrieved by exposing the storage medium to the reference beam alone, which interacts with the stored holographic data to generate a reconstructed signal beam proportional to the initial signal beam used to store the holographic image
Data Source
AI summary
There are provided compositions, optical data storage media and methods of using the optical data storage. The compositions comprise a non-linear sensitizer comprising one or more platinum ethynyl complexes capable of absorbing actinic radiation to cause upper triplet energy transfer to a reactant that undergoes a photochemical change upon triplet excitation.