Related Experiment Video
Updated: Dec 15, 2025
12:18
Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
Published on: August 5, 2013
17.4K
Coupler-induced phase matching of resonant hyperparametric scattering
Optics Letters
|July 8, 2020
Summary
An evanescent field coupler breaks microcavity symmetry, enabling the generation of unique frequency harmonics. This explains experimental frequency comb generation in magnesium fluoride resonators with normal group velocity dispersion.
Area of Science:
- Optics and Photonics
- Cavity Quantum Electrodynamics
- Nonlinear Optics
Background:
- High quality factor (high-Q) monolithic ring microcavities are fundamental in photonic devices.
- Breaking the symmetry of these microcavities is crucial for controlling light-matter interactions and generating novel optical phenomena.
- Whispering gallery mode resonators are known for their high Q-factors and potential in nonlinear optics.
Purpose of the Study:
- To demonstrate how an evanescent field coupler can break the symmetry of a high-Q monolithic ring microcavity.
- To explain the generation of strongly nondegenerate frequency harmonics involving orthogonal mode families.
- To elucidate the mechanism behind experimental frequency comb generation in magnesium fluoride (MgF2) whispering gallery mode resonators.
Main Methods:
- Utilizing an evanescent field coupler to perturb the microcavity.
- Analyzing the symmetry breaking in the microcavity.
- Investigating the generation of frequency harmonics and their properties.
- Correlating theoretical findings with experimental observations in MgF2 resonators.
Main Results:
- Demonstrated that an evanescent field coupler effectively breaks the symmetry of a high-Q monolithic ring microcavity.
- Observed the generation of strongly nondegenerate frequency harmonics involving multiple, orthogonal mode families.
- Successfully explained the experimental generation of frequency combs in MgF2 whispering gallery mode resonators.
- Linked the observed phenomena to the strong normal group velocity dispersion present in the resonators.
Conclusions:
- Symmetry breaking via evanescent field coupling is a viable method for controlling microcavity modes.
- This technique enables the generation of complex and nondegenerate frequency harmonics.
- The findings provide a clear explanation for frequency comb generation in MgF2 resonators, advancing the understanding of nonlinear phenomena in optical microcavities.
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