Optically Configurable Charge-Transfer Film for Rewritable Codes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a need for materials and processes that can tune the responsiveness of optically active, organic materials, particularly for applications in coatings, films, and electronics, where existing technologies face challenges in achieving optically writable and rewritable functionalities.
Innovation Solution
A film composed of a charge-transfer material with domains that can be thermally melted using optical sources to create patterns, allowing for the writing, erasing, and rewriting of optical codes by controlling the alignment of anisotropic and isotropic phases within the material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If optically active organic materials are used for coatings and films, then unique assemblies can be provided, but tuning the responsiveness remains challenging
Solution Approach 1:
The patent employs composite materials by combining charge-transfer complexes formed from electron-donor and electron-acceptor molecules with liquid crystalline hosts. This composite approach enables tuning of optical responsiveness through selection of different donor-acceptor pairs and host materials, while maintaining manageable system complexity through modular design
Solution Approach 2:
The patent utilizes parameter changes by varying the molecular structure of donor and acceptor components, changing the stoichiometric ratios, and adjusting the liquid crystalline host parameters to tune the optical responsiveness. This allows systematic control of material properties without fundamentally changing the material system
2Ease of operation
If charge-transfer materials are used to create optical patterns, then optically writable and rewritable functionality is achieved, but precise control of molecular alignment is required
Solution Approach 1:
The patent exploits phase transitions of liquid crystalline materials, specifically the transition between isotropic and anisotropic phases, to achieve optical patterning. By controlling temperature and optical field application, the material transitions between states that are easily writable and maintain precise molecular alignment
Solution Approach 2:
The patent replaces mechanical alignment methods with optical field control mechanisms. Optical fields are used to induce and maintain molecular alignment in the charge-transfer complexes, eliminating the need for mechanical precision in the writing process while achieving the desired molecular orientation
3Adaptability or versatility
If anisotropic regions are patterned within the film, then optical code functionality is provided, but the material must maintain stability while allowing reconfiguration
Solution Approach 1:
The patent introduces dynamics by making the molecular alignment state controllable and reversible through optical fields and temperature control. The charge-transfer complexes can dynamically switch between aligned and unaligned states, enabling rewriting functionality while the underlying molecular structure remains stable
Solution Approach 2:
The patent utilizes periodic action through cyclic heating and cooling cycles, as well as repeated application and removal of optical fields, to enable multiple write-erase-write cycles. This periodic stimulation allows the material to maintain stability between cycles while achieving reconfigurability during the cycles
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
Enables the creation of optically rewritable materials with controlled dichroic properties, allowing for precise patterning and reconfiguration of molecular order, suitable for applications in displays, smart authentication, and data storage.
Implementation Method 1
thermally melting the film (e.g., by exposing the film to a first source, such as a first optical source)
Implementation Method 2
exposing the film to a first source, such as a first optical source
Implementation Method 3
each of the plurality of first regions includes a first optically anisotropic phase (e.g., a phase including a plurality of aligned domains arranged in an aligned columnar phase characterized by a first columnar director)
Implementation Method 4
Enables the creation of optically rewritable materials with controlled dichroic properties
Data Source
AI summary
The present invention relates to an optical code including a film of a charge-transfer material, as well as methods thereof. Described herein are optical codes having anisotropic and/or isotropic regions within the film, which can be provided in a pattern that serves as an optical code.