AAO-Based Light Guiding Structure for UV Propagation
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Solution Overview
Problem
Current light guiding structures for ultraviolet (UV) radiation face challenges in efficiently propagating UV light with low loss and maintaining stability, especially in applications requiring high power and flexibility, such as phototherapy and industrial uses.
Innovation Solution
A light guiding structure incorporating an anodized aluminum oxide (AAO) layer with a fluoropolymer layer, where light propagates substantially parallel to the fluoropolymer layer, and an optoelectronic device can be coupled to the AAO layer for emission or sensing, enabling efficient UV light guidance with minimal loss and flexibility in device thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If solid-core fused silica fibers are used to guide UV light, then light propagation is achieved, but high attenuation and solarization at high optical powers occur
Solution Approach 1:
The patent employs a composite structure consisting of a fluoropolymer core (low UV absorbance) surrounded by a cladding layer with lower refractive index. This composite material approach allows the core to transmit UV light with minimal absorption while the cladding provides total internal reflection, solving both the attenuation and stability issues of solid-core fused silica fibers under high optical powers.
Solution Approach 2:
The patent utilizes a liquid core waveguide approach where purified water or other liquids with low UV absorbance replace the solid core material. This liquid core can be circulated and replaced, preventing permanent degradation from solarization while maintaining low attenuation, thus improving reliability under high optical powers.
2Loss of energy
If hollow-core photonic crystal fiber is used to reduce glass-material interaction, then light propagation loss is reduced, but structural complexity increases
Solution Approach 1:
The patent employs a relatively simple layered structure with a fluoropolymer core and a cladding layer, avoiding the complex periodic microstructure of photonic crystal fibers. This simpler layered design achieves low loss through total internal reflection at the core-cladding interface while significantly reducing structural complexity compared to HC-PCF designs.
3Loss of energy
If liquid core waveguide with purified water is used, then low UV absorbance and flexibility are achieved, but device complexity and fabrication difficulty increase
Solution Approach 1:
The patent selects fluoropolymer as the core material, which inherently possesses low UV absorbance properties similar to liquid cores but in a solid, stable form. This parameter change from liquid to solid fluoropolymer maintains the low attenuation benefit while dramatically simplifying fabrication, as the fluoropolymer can be deposited as a stable film that does not require containment or circulation systems.
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 AAO-fluoropolymer structure provides efficient UV light propagation with low attenuation, stability under high optical powers, and flexibility in device thickness, suitable for various applications including phototherapy and industrial uses.
Implementation Method 1
Light is confined in such flow cells within the (liquid) core by total internal reflection (TIR) at the liquid core/wall interface or the liquid core/cladding (coating) interface
Implementation Method 2
Light is confined in such flow cells within the (liquid) core by total internal reflection (TIR) at the liquid core/wall interface or the liquid core/cladding (coating) interface. The only requirement is that the liquid core refractive index be higher than that of the refractive index of the ambient.
Data Source
AI summary
A light guiding structure is provided. The structure includes an anodized aluminum oxide (AAO) layer and a fluoropolymer layer located immediately adjacent to a surface of the AAO layer. Light propagates through the AAO layer in a direction substantially parallel to the fluoropolymer layer. An optoelectronic device can be coupled to a surface of the AAO layer, and emit/sense light propagating through the AAO layer. Solutions for fabricating the light guiding structure are also described.