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Dynamics of coupled plasmon polariton wave packets excited at a subwavelength slit in optically thin metal films

机译:光学金属薄膜中亚波长缝隙激发的耦合等离激元极化波包的动力学

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摘要

We study by numerical simulations the excitation and propagation dynamics of coupled surface plasmon polariton (SPP) wave packets (WPs) in optically thin Ag films and a bulk Ag/vacuum interface under the illumination of a subwavelength slit by 400 nm continuous wave (cw) and femtosecond pulsed light. The generated surface fields include contributions from both SPPs and quasicylindrical waves, which dominate in different regimes. We explore aspects of the coupled SPP modes in Ag thin films, including symmetry, propagation, attenuation, and the variation of coupling with incident angle and film thickness. Simulations of the electromagnetic transients initiated with femtosecond pulses reveal new features of coupled SPP WP generation and propagation in thin Ag films. Our results show that, under pulsed excitation, the SPP modes in an Ag thin film break up into two distinct bound surface wave packets characterized by marked differences in symmetries, group velocities, attenuation lengths, and dispersion properties. The nanometer spatial and femtosecond temporal scale excitation and propagation dynamics of the coupled SPP WPs are revealed in detail by movies recording the evolution of their transient field distributions.
机译:我们通过数值模拟研究在400 nm连续波(cw)切割的亚波长照射下,光学薄膜Ag薄膜和块状Ag /真空界面中的耦合表面等离振子极化(SPP)波包(WPs)的激发和传播动力学飞秒脉冲光产生的表面场包括来自SPP和准工业波的贡献,它们在不同的情况下占主导地位。我们探索了Ag薄膜中耦合SPP模式的各个方面,包括对称性,传播,衰减以及耦合随入射角和膜厚的变化。飞秒脉冲引发的电磁瞬变的仿真揭示了耦合的SPP WP在银薄膜中生成和传播的新特征。我们的结果表明,在脉冲激发下,Ag薄膜中的SPP模式分解为两个不同的束缚表面波包,其特征在于对称性,基团速度,衰减长度和色散特性明显不同。通过记录瞬态场分布演变的电影详细揭示了耦合的SPP WP的纳米级空间和飞秒时间尺度的激发和传播动力学。

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