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A study of high-index-contrast 90 degree waveguide bend structures
Optics Express
|May 7, 2009
Summary
We evaluated waveguide bends in high index contrast materials. Optimized designs using corner mirrors and phase retarders achieve high transmission, crucial for integrated optics.
Area of Science:
- Integrated optics
- Waveguide design
- Photonics
Background:
- Designing efficient waveguide bends is critical for integrated optical circuits.
- High index contrast materials offer potential for miniaturization but pose design challenges for bends.
Purpose of the Study:
- To evaluate design parameters for low-loss right-angle waveguide bends.
- To optimize bend structures for high-density integrated optical components.
Main Methods:
- Finite difference time domain (FDTD) method applied to 2D bend structures.
- Systematic variation of bend geometry parameters.
Main Results:
- High bend transmission achieved using a low-Q resonant cavity.
- Comparable or superior performance obtained with a corner mirror and phase retarder combination.
- Double corner mirror structures further enhance transmission with minimal area increase.
Conclusions:
- Optimized waveguide bend designs are feasible in high index contrast systems.
- Corner mirror and phase retarder structures offer efficient solutions for low-loss bends.
- Advanced structures like double corner mirrors enable high performance with compact footprints.
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