AI 中文总结
本研究针对亚波长相变光子学中热失控未被探索的问题，通过耦合全波电动力学与热传递的迭代多物理场框架，发现VO₂纳米结构存在光诱导热失控，其阈值受多因素影响，为相关器件设计提供了关键原则。
AI 中文摘要
热失控现象广泛存在于多个物理学科，但亚波长相变光子学领域中尚未发现其存在，因为现有热光模型在尖锐光学跃迁附近会失效。本研究引入一种将全波电动力学与热传递耦合的迭代多物理场框架，在二氧化钒（VO₂）纳米结构中发现了光诱导热失控。该失控切换阈值取决于照明波长、环境温度和基底，外部热偏置可显著降低失控触发所需的光强。研究结果推进了尖锐光热跃迁的建模，并为主动超表面、神经形态光子器件及纳米尺度热管理提供了关键设计原则。
英文摘要
While thermal runaway occurs across diverse physical disciplines, its presence in subwavelength phase-change photonics remains unexplored because existing thermo-optical models break down near sharp optical transitions. Here, we introduce an iterative multiphysics framework coupling full-wave electrodynamics with heat transfer, and we discover optically induced thermal runaway in vanadium dioxide (VO2) nanostructures. The runaway switching threshold depends on the illumination wavelength, ambient temperature, and underlying substrate, with external thermal biasing significantly reducing the optical intensity required for runaway ignition. Our results push forward the modeling of sharp photothermal transitions and provide essential design principles for active metasurfaces, neuromorphic photonic devices, and nanoscale thermal management.
