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DOE OSTI · 3006292

COMSOL Simulation of Optical Whispering Gallery Mode (WGM) Resonator

Chen, Xiaoyu [Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)]
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Abstract

We simulate whispering-gallery mode coupling in a Si$_3$N$_4$--LiNbO$_3$ waveguide--resonator system using 2D and 3D COMSOL models. Results show that the TM$_{00}$ mode couples far more efficiently than TE$_{00}$ due to weaker confinement and stronger evanescent overlap, with critical coupling reached near a 0.20~µm gap. The study highlights polarization dependence, geometric sensitivity, and birefringence as key factors shaping resonant behavior.

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Chen, Xiaoyu [Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)]. 2025-08-18. COMSOL Simulation of Optical Whispering Gallery Mode (WGM) Resonator. https://doi.org/10.2172/3006292

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