Optothermal dynamics in microresonators operating on an exceptional surface
We investigated the optothermal dynamics of optical microresonators operating on a chiral exceptional surface (ES). ES is formed via unidirectional coupling between the clockwise and counterclockwise modes of a microtoroid resonator using a fiber loop mirror placed at one end of the taper fiber wave...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
AIP Publishing LLC
2025-06-01
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| Series: | APL Photonics |
| Online Access: | http://dx.doi.org/10.1063/5.0261972 |
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| Summary: | We investigated the optothermal dynamics of optical microresonators operating on a chiral exceptional surface (ES). ES is formed via unidirectional coupling between the clockwise and counterclockwise modes of a microtoroid resonator using a fiber loop mirror placed at one end of the taper fiber waveguide used to couple light in and out of the resonator. By tuning the strength of unidirectional coupling and, hence, the chirality of the ES under various coupling conditions, we examine the impact of the dynamic optothermal response of the resonator on the transmission and reflection spectra. Our theoretical model, supported by numerical simulations and experiments, reveals that the transmission spectra deviate from the response of the same resonator operating at a diabolic point, while the reflection spectra broaden from a squared-Lorentzian profile. These findings emphasize the complex interplay between optothermal effects and non-Hermitian dynamics in optical resonators, offering valuable insights for designing thermally stable optical systems. |
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| ISSN: | 2378-0967 |