Tellurium Single-Element Phase-Change Optical Structure for Durable Modulation
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Solution Overview
Problem
Existing compound-based optical phase change materials suffer from durability issues due to defects like oxygen vacancies, particularly when formed into small structures, and require complex optimization processes with high energy consumption for phase changes.
Innovation Solution
A single element phase change optical structure using tellurium (Te) is developed, which includes a base layer, an optical phase change layer containing Te, and a protective layer, allowing for phase and thickness changes to modulate light properties without additional energy consumption, and is deposited using thermal evaporation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compound-based optical phase change materials are used, then light modulation properties can be achieved, but durability deteriorates due to defects like oxygen vacancies
Solution Approach 1:
The patent extracts and removes the problematic compound structure, using pure tellurium single element instead of compound-based materials (e.g., GeSbTe). This eliminates the source of oxygen vacancies and other defects inherent in compound materials, thereby improving durability while maintaining optical phase change properties
Solution Approach 2:
The patent changes the material parameter from compound-based composition to single element tellurium. This fundamental material parameter change eliminates the chemical complexity that leads to defects, while the phase change properties of tellurium provide the necessary optical modulation functionality
2Power
If compound-based optical phase change materials are used, then phase change functionality is achieved, but energy consumption increases due to complex optimization processes
Solution Approach 1:
The patent extracts and eliminates the complex optimization processes required for compound-based materials by using pure tellurium. The single element nature of tellurium simplifies the material system, removing the need for complex compositional optimization and reducing the energy required for phase change operations
Solution Approach 2:
The patent changes the material parameter from multi-element compounds to single element tellurium, which has simpler phase change characteristics. This parameter change reduces the energy consumption associated with heating and cooling cycles while eliminating the need for complex process optimization
3Speed
If liquid crystal is used in spatial light modulator, then light path control is achieved, but operation speed deteriorates
Solution Approach 1:
The patent utilizes the rapid phase change properties of tellurium, which can switch between solid and liquid phases extremely quickly (faster than 500 fs). This phase transition mechanism provides much faster operation speed compared to liquid crystal-based systems, while the refractive index changes during phase transition enable effective light path control
4Ease of manufacture
If compound-based materials are used, then optical phase change properties are achieved, but manufacturing complexity increases
Solution Approach 1:
The patent extracts and removes the manufacturing complexity associated with compound-based materials by using pure tellurium. The single element material can be deposited using standard thermal evaporation techniques without requiring complex compositional control or multi-step fabrication processes, thereby simplifying manufacturing
Solution Approach 2:
The patent changes the material parameter from compounds requiring precise compositional control to single element tellurium. This parameter change simplifies the deposition process, eliminating the need for complex optimization of multiple material components while maintaining the optical phase change functionality
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 Te-based structure enhances durability, maximizes light modulation properties, and achieves active color modulation effects by combining thickness and phase changes, with improved optical properties and reduced energy consumption.
Implementation Method 1
a phase change material refers to a phase change substance in which a phase of a substance varies depending on changes in the temperature
Implementation Method 2
a refractive index varies accordingly... the refractive index needs to be controlled in accordance with an external signal
Implementation Method 3
The optical phase change layer 200 is deposited on the upper surface of the base layer 100 using a thermal evaporation method
Data Source
AI summary
An embodiment relates to a single element phase change optical structure containing tellurium and a use thereof, and the structure is capable of overcoming a problem of defects of compound-based materials, improving durability, and maximizing optical modulation properties as well by replacing an existing compound-based optical phase change material with a tellurium (Te) single element. The embodiment is capable of maximizing an active color modulation effect by simultaneously using properties of thickness change and phase change of the tellurium (Te), and is also capable of achieving different optical properties by including various shapes of tellurium nanostructures.