基于偏振调控金纳米方孔阵列的瞬态光学特性

Manipulation of Transient Optical Properties ofGold Square Nanopore Arrays Based on Polarization

为了明确全光调控中泵浦光偏振对金属纳米结构的瞬态光学特性的调制机制,以金纳米方孔阵列为对象,通过电磁场-传热耦合仿真研究了两种偏振条件下等离激元模式的瞬态光学响应。研究表明,当偏振为0°时等离激元模式可以得到比90°时更强更快的瞬态光学响应,并且不同的等离激元模式诱导产生的瞬态光学响应也存在明显的差异。通过分别求解不同泵浦条件下结构表面的电子温度分布情况,进一步揭示了偏振对瞬态光学特性调控的物理机制。该研究可为超快光场调控提供一种新的思路,并有助于从物理机制上理解表面等离激元共振相关的超快非线性光学效应。

To elucidate the modulation mechanism of the polarization direction of pump light on the transient optical properties of metal nanostructures in all-optical regulation,a study was conducted using a gold square nanopore array as the subject.Through electromagnetic-thermal coupling simulations,the transient optical response of plasmon modes under two different polarization conditions was investigated.The results revealed that when the polarization direction of the pump light aligned with that of the probe light,the plasmon mode exhibited a stronger and faster transient optical response compared to the misaligned scenario.Additionally,significant differences were observed in the transient optical responses induced by various plasmon modes.This study offers a novel approach for ultrafast optical field modulation and enhances our understanding of the ultrafast nonlinear optical effects associated with surface plasmon resonance from a mechanistic perspective.