Geints, Y., Minin, I. V., & Minin, O. V. (2023). Magnetic Whispering-Gallery Super-resonance Spoiling in a Drude-Kerr Optical Cavity. Optics Communications, 130149.
Geints, Y., Minin, I. V., & Minin, O. V. (2023). Magnetic Whispering-Gallery Super-resonance Spoiling in a Drude-Kerr Optical Cavity. Optics Communications, 130149.
Geints, Y., Minin, I. V., & Minin, O. V. (2023). Magnetic Whispering-Gallery Super-resonance Spoiling in a Drude-Kerr Optical Cavity. Optics Communications, 130149.
Geints, Y., Minin, I. V., & Minin, O. V. (2023). Magnetic Whispering-Gallery Super-resonance Spoiling in a Drude-Kerr Optical Cavity. Optics Communications, 130149.
Abstract
High-quality optical Fano resonances, which exist in a spherical dielectric microparticle in the spatial configurations of the "whispering-gallery modes" (WGMs) and recently are referred to as the “super-resonances”, possess extremal sensitivity not only to the micro-cavity size and shape but also to the optical properties of the particulate material. The increase in the power of light radiation coupling into a super-resonance can lead to the manifestation of strong optical nonlinearity of the resonator material due to the cubic nonlinearity (optical Kerr effect) and generation of free electron plasma in certain regions of the spherical microcavity. In fact, an optically linear medium of the resonance cavity transforms into a Drude-Kerr-type medium with a strong dependence on input laser intensity. With the help of the finite-elements numerical simulations, we theoretically analyze the transformations of the resonant contour for a number of high-quality WGMs excited in a lanthanum-glass microsphere exposed to an optical radiation of different intensity. We show that in a certain input intensity range, the competition of Kerr and plasma optical nonlinearities can stop and even reverse the Stokes shift of the super-resonance observed in a pure Kerr medium. Additionally, optical ionization and plasma generation within the mode volume significantly reduce the strength of the magnetic super-resonance and lead to its spoiling and frequency splitting.
Keywords
superresonance; mesotronics; Kerr effect; laser; strong magnetic field
Subject
Physical Sciences, Condensed Matter Physics
Copyright:
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