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Updated: Nov 10, 2025
12:18
Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
Published on: August 5, 2013
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Birefringent whispering gallery cavities designed by linear transformation optics.
Optics Express
|April 6, 2021
Summary
Researchers designed new whispering gallery cavities using linear coordinate transformations. These cavities support high-quality (high-Q) resonant modes with directional emission, offering a novel approach to optical cavity design.
Area of Science:
- Optics and Photonics
- Materials Science
- Quantum Optics
Background:
- Whispering gallery cavities (WGCs) are known for supporting high-Q resonant modes.
- Previous WGC designs utilized conformal transformation optics, resulting in gradient index profiles.
- These gradient index profiles implement conformal mappings in physical space.
Purpose of the Study:
- To propose a new design scheme for whispering gallery cavities.
- To investigate cavities with piecewise-homogeneous, anisotropic index profiles.
- To demonstrate high-Q resonant modes and directional emission in these novel cavities.
Main Methods:
- Utilized linear coordinate transformation for cavity design.
- Employed numerical simulations to analyze cavity performance.
- Employed phase space representation (Poincaré Husimi function) for wave function analysis.
Main Results:
- Successfully designed WGCs with piecewise-homogeneous, anisotropic index profiles.
- Demonstrated that these cavities support high-Q whispering gallery modes.
- Observed directional far-field emission patterns from the designed cavities.
Conclusions:
- The proposed linear coordinate transformation offers an alternative to conformal mapping for WGC design.
- The new design scheme enables high-Q modes and directional emission.
- Phase space representation is a valuable tool for verifying WGC characteristics.
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