Whispering Gallery Mode Microresonator Dynamics
Summary
Whispering gallery mode (WGM) microresonators confine light by continuous total internal reflection along a curved dielectric boundary, yielding ultrahigh quality factors and small mode volumes. The interplay of optical, thermal and mechanical effects gives rise to a rich set of dynamic behaviours, including nonlinear resonance shifts, thermal bistability, self-pulsing and optomechanical oscillations. Such dynamics underpin applications in precision sensing, low-threshold lasing, frequency comb generation and quantum information processing. Control of the thermal environment and optical feedback loops has enabled stable operation even under high circulating powers, while advanced fabrication of toroids, microspheres and microcapillaries has expanded the accessible spectral and modal landscapes. The global significance of this field lies in its capacity to deliver integrated photonic devices for environmental monitoring, telecommunications and fundamental studies of light–matter interaction.
Research from Nature Portfolio
Recent studies have demonstrated laser-assisted tuning of WGMs in solid-core microstructured optical fibres infiltrated with magnetic fluids. By exploiting the absorption of pump light within the fluid-filled holes, researchers achieved centimetre-scale cylindrical resonators with Q-factors exceeding 4 × 104 and a resonance wavelength sensitivity of approximately 0.034 nm per milliwatt. The simple capillary-action fabrication and linear power dependence of the wavelength shift offer a versatile platform for optical filtering, high-sensitivity sensing and future all-optical signal-processing networks.
Whispering Gallery Mode Microresonator Dynamics publication trend
The graph below shows the total number of articles in whispering gallery mode microresonator dynamics across all publications each year (not limited to Nature Index journals).
Technical terms
Whispering gallery mode (WGM): A resonant optical mode confined by continuous total internal reflection along a curved dielectric interface.
Quality factor (Q): A dimensionless measure of resonator energy storage efficiency, defined by the ratio of stored energy to energy lost per cycle.
Thermal bistability: A nonlinear phenomenon in which the resonant frequency of a microresonator exhibits two stable states due to temperature-dependent refractive-index changes.
Evanescent coupling: Energy transfer between a waveguide and a resonator through overlapping decaying electromagnetic fields beyond the waveguide boundary.
References
- Laser-tuned whispering gallery modes in a solid-core microstructured optical fibre integrated with magnetic fluids. Scientific Reports (2015).
- Trapping photons with optical black hole. Light: Science & Applications (2023).
- Optothermal dynamics in whispering-gallery microresonators. Light: Science & Applications (2020).
- Dynamical thermal behavior and thermal self-stability of microcavities. Optics Express (2004).
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