AI 中文总结
研究光与光子时间晶体的非厄米相互作用，通过相对相位补偿失谐抑制弗洛凯模式，发现传统方法无法再现该光学响应，揭示有效模式耦合，还通过例外点研究相变并解释抑制动力学，展现光子时间晶体在时间调制纳米光子学中的潜力。
AI 中文摘要
我们报告了光子时间晶体中由其动量带隙内的光诱导的非厄米模式耦合。当光与光子时间晶体之间的相对相位补偿失谐时，我们观察到指数增长的弗洛凯模式的周期性抑制。相比之下，传统的格林函数弗洛凯展开无法再现该区域的光学响应，这表明光诱导了超越准正常模式近似的有效模式耦合。我们进一步通过例外点研究宇称 - 时间相变，并基于相位、失谐和调制幅度定量解释抑制动力学。与光的非平凡相互作用和可控的非厄米性表明光子时间晶体在时间调制纳米光子学中具有巨大潜力。
英文摘要
We report non-Hermitian mode couplings in a photonic time crystal induced by the light within its momentum bandgap. When the relative phase between the light and the photonic time crystal compensates for the detuning, we observe a periodic suppression of exponentially growing Floquet modes. In contrast, the optical response in this regime cannot be reproduced by the conventional Floquet expansion of the Green's function, revealing that the light induces effective mode couplings beyond the quasinormal mode approximation. We further investigate the parity-time phase transition through the exceptional point and quantitatively explain the suppression dynamics based on the phase, detuning, and modulation amplitude. The nontrivial interaction with light and the controllable non-Hermiticity indicate the great potential of photonic time crystals in temporally modulated nanophotonics.
