全介质超腔的非线性光学加热：通过巨热折射双稳态实现高效的光热转换
Nonlinear optical heating of all-dielectric super-cavity: efficient light-to-heat conversion through giant thermorefractive bistability
摘要：
共振纳米结构的光学加热是现代纳米光子学的关键问题之一，根据应用的不同，可能是有害的，也可能是期望的。尽管对于金属和半导体谐振系统，光-热转换的线性状态被很好地研究为临界耦合条件，但是仍然缺少在高强度光照射下优化光学加热的明确策略。在这项工作中，我们提出了一个简单的分析模型，这样的问题考虑到材料的性质变化所造成的加热。它使我们能够推导出一个新的一般临界耦合条件的非线性情况下，需要违反直觉的初始光谱之间的泵浦光频率和共振的不匹配。基于所提出的策略，我们开发了一种有效的非线性光学加热的优化设计，它采用了一个圆柱形的纳米粒子支持准束缚态的连续模式（准BIC或所谓的“超腔模式”）由入射方位角矢量光束激发。我们的方法为与光学加热和双稳态相关的各种非线性实验提供了背景，其中强激光束的自作用可以改变被照射纳米结构的共振特性。
英文摘要：
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 is well-studied both for metal and semiconductor resonant systems generalized as critical coupling condition, the clear strategy to optimize optical heating upon high-intensity light irradiation is still missing. In this work, we propose a simple analytical model for such 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 counterintuitive initial spectral mismatch between the pumping light frequency and resonant one. Basing on the suggested strategy, we develop an optimized design for efficient nonlinear optical heating, which employs a cylindrical nanoparticle supporting 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.
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