Lithium Electro-Optic Device With Angled Slab Surfaces for Stress Mitigation
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Solution Overview
Problem
Existing electro-optic devices face challenges such as high optical losses, scattering losses from sidewalls, and absorption losses due to materials like bulk lithium niobate, limiting their performance and fabrication efficiency.
Innovation Solution
The use of thin film electro-optic materials with lithium niobate or lithium tantalate, featuring a slab with free surfaces at a nonzero angle from the top surface, and ridge waveguides, along with high-temperature annealing and UV/DUV lithography, reduces stress and improves surface roughness, thereby enhancing optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If bulk lithium niobate is used in electro-optic devices, then the refractive index modulation is enhanced, but optical losses increase due to scattering and absorption
Solution Approach 1:
The patent transitions from bulk lithium niobate to thin film lithium niobate structures. The thin film configuration reduces scattering losses from sidewalls and absorption losses from material bulk characteristics while maintaining the electro-optic modulation capability through the thin film waveguide structure.
Solution Approach 2:
The patent divides the bulk material into thin film layers and segmented waveguide structures. This segmentation allows the light to propagate through multiple interfaces and structures, reducing the impact of any single interface's scattering losses and enabling better control over optical path length and mode confinement.
2Reliability
If bulk lithium niobate waveguides are fabricated, then electro-optic functionality is achieved, but fabrication complexity and manufacturing challenges increase
Solution Approach 1:
The thin film structure simplifies fabrication compared to bulk waveguides. The thin film can be deposited using standard semiconductor fabrication techniques, and the waveguide patterns can be formed through lithography and etching processes, reducing the complexity of bulk material processing and bulk acoustic resonance structure fabrication.
3Quantity of substance
If conventional waveguide structures are used, then basic optical transmission is achieved, but scattering losses from sidewalls increase
Solution Approach 1:
The thin film waveguide structure reduces the surface area where scattering occurs. By confining the light within a thin film layer, the interaction with sidewalls and reducing the overall surface area, scattering losses are minimized while maintaining adequate optical transmission.
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
This approach reduces optical losses and stress-induced damage, facilitating improved fabrication and reliability of electro-optic devices with enhanced modulation capabilities.
Implementation Method 1
An electro-optic material exhibits the electro-optic effect and has its index of refraction modulated by an electric field
Implementation Method 2
Each of the free surfaces is at a nonzero angle from the top surface of the slab and mitigates stress in the slab
Implementation Method 3
high-temperature annealing and UV/DUV lithography, reduces stress and improves surface roughness
Implementation Method 4
UV/DUV lithography, reduces stress and improves surface roughness
Data Source
AI summary
An electro-optic device is described. The electro-optic device includes at least one optical material having an electro-optic effect. Further, the optical material(s) include lithium. The optical material(s) have a slab and a ridge waveguide. The slab has a top surface. The slab includes free surfaces. Each of the free surfaces is at a nonzero angle from the top surface of the slab and mitigates stress in the slab.