表面电磁波在亚波长孔阵列铝膜中的超快响应
Ultrafast response of surface electromagnetic waves in an aluminum film perforated with subwavelength hole arrays
摘要：
利用时间分辨率为100 fs的瞬态光调制技术，研究了亚波长孔阵列铝膜表面光生超快电磁波的动力学过程。我们观察到一个明显的蓝移的共振传输带，揭示了等离子体衰减的纳米孔阵列的光学响应中的重要作用。蓝移与等离子体激元的超常传输机制不一致，并指出了干涉在传输带形成中的关键作用。瞬态光调制光谱内的电子-声子弛豫动力学，涉及非平衡热电子和准平衡声子的玻尔兹曼方程方法成功地建模。
英文摘要：
The ultrafast dynamics of surface electromagnetic waves photogenerated on aluminum film perforated with subwavelength holes array was studied in the visible spectral range by the technique of transient photomodulation with 100 fs time resolution. We observed a pronounced blueshift of the resonant transmission band that reveals the important role of plasma attenuation in the optical response of nanohole arrays. The blueshift is inconsistent with plasmonic mechanism of extraordinary transmission and points to the crucial role of interference in the formation of transmission bands. The transient photomodulation spectra were successfully modeled within the Boltzmann equation approach for the electron-phonon relaxation dynamics, involving non-equilibrium hot electrons and quasi-equilibrium phonons.
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