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- Title
Nonlinear optical heating of all-dielectric super-cavity: efficient light-to-heat conversion through giant thermorefractive bistability.
- Authors
Ryabov, Daniil; Pashina, Olesiya; Zograf, George; Makarov, Sergey; Petrov, Mihail
- Abstract
Optical heating of resonant nanostructures is one of the key issues in modern nanophotonics, being either harmful or desirable effect depending on the applications. Despite a linear regime of light-to-heat conversion being well-studied both for metal and semiconductor resonant systems is generalized as a critical coupling condition, the clear strategy to optimize optical heating upon high-intensity light irradiation is still missing. This work proposes a simple analytical model for such a problem, taking into account material properties changes caused by the heating. It allows us to derive a new general critical coupling condition for the nonlinear case, requiring a counterintuitive initial spectral mismatch between the pumping light frequency and the resonant one. Based on the suggested strategy, we develop an optimized design for efficient nonlinear optical heating, which employs a cylindrical nanoparticle supporting the quasi bound state in the continuum mode (quasi-BIC or so-called 'super-cavity mode') excited by the incident azimuthal vector beam. Our approach provides a background for various nonlinear experiments related to optical heating and bistability, where self-action of the intense laser beam can change resonant properties of the irradiated nanostructure.
- Subjects
QUASI bound states; HEATING; VECTOR beams; OPTICAL bistability; LASER beams; EXCIMER lasers; FEMTOSECOND lasers
- Publication
Nanophotonics (21928606), 2022, Vol 11, Issue 17, p3981
- ISSN
2192-8606
- Publication type
Article
- DOI
10.1515/nanoph-2022-0074