Quantum Dot Optical Waveguide for Tunable Wavelength Conversion
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Solution Overview
Problem
Conventional optical waveguides exhibit optimal transmission characteristics only at specific wavelengths and have limited responsiveness to external electrical or optical control.
Innovation Solution
A substrate with a patterned optical waveguide using quantum dots as a photosensitive material, allowing for adjustable wavelength collection and conversion, featuring branching points with different wavelength ranges and quantum dot layers of varying sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional optical waveguide materials (silicon, indium phosphide, silica) are used, then optimal transmission characteristics are achieved at specific wavelengths, but the waveguide has limited responsiveness to external electrical or optical control and cannot easily adjust wavelength
Solution Approach 1:
The patent applies parameter changes by utilizing quantum dots with varying sizes to tune the absorption and emission wavelengths of the optical waveguide. By changing the quantum dot size parameter, the waveguide can operate at different wavelengths, achieving wavelength adjustability while maintaining reliable light transmission through the quantum confined Stark effect for electrical control.
Solution Approach 2:
The patent employs composite materials by integrating quantum dots into the optical waveguide structure. This composite approach combines the optical guiding properties of conventional waveguide materials with the wavelength-tunable properties of quantum dots, enabling both adaptability to different wavelengths and stable transmission characteristics through the composite structure.
2Adaptability or versatility
If quantum dots of different sizes are used in branching optical waveguides, then multiple wavelength ranges can be collected and converted, but the device complexity increases due to multiple quantum dot layers with different average sizes
Solution Approach 1:
The patent applies segmentation by dividing the optical waveguide into multiple branches, with each branch containing quantum dots of different sizes. This segmentation allows each branch to handle specific wavelength ranges independently, enabling multi-wavelength conversion while maintaining a relatively simple overall structure through modular branching design.
Solution Approach 2:
The patent implements local quality by assigning different quantum dot sizes to different spatial locations (branches) of the optical waveguide. Each local region has optimized quantum dot characteristics for its specific function, enabling wavelength-specific processing in different branches while keeping the overall device manageable through localized 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
Enables conversion of incident light into different wavelengths without external devices, enhancing light transmission efficiency and controllability by tuning wavelengths based on quantum dot size.
Implementation Method 1
a quantum dot layer formed on the surface of the optical waveguide, wherein the quantum dot layer may comprise quantum dots dispersed in an organic medium
Data Source
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AI summary
The present invention relates to a substrate comprising a patterned optical waveguide, the substrate comprising: an optical waveguide formed on the substrate with directionality and extending in at least one direction; and a quantum dot layer formed on a surface of the optical waveguide, wherein the quantum dot layer comprises quantum dots dispersed in an organic medium.