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首页> 外文期刊>Plasmonics >Features of Local Electric Field Excitation in Asymmetric Nanocross Illuminated by Ultrafast Laser Pulse
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Features of Local Electric Field Excitation in Asymmetric Nanocross Illuminated by Ultrafast Laser Pulse

机译：超快激光脉冲照射不对称纳米交叉中的局部电场激励特性

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摘要

Features of the asymmetric nanocross including extinction spectrum, local electric field intensity, and temporal response of the local electric field under ultrashort laser illumination are investigated in this paper. It is found that, due to the simultaneous excitation of local electric fields in the arms that are perpendicular and parallel to the laser polarization direction of the asymmetric nanocross, extinction spectrum exhibits multiple resonant peaks and the position of the peaks can be tuned by changing the lengths of the arms. Simulation results disclose that there is a strong connection between optical response of the parallel and perpendicular arms. Moreover, temporal response of electric field in arms of the asymmetric nanocross shows that oscillations in the parallel arms start earlier than that of the perpendicular arms, and they are in phase when one of the parallel arms resonantly excited, which further reflects the relationship between the parallel and perpendicular arms. Therefore, we demonstrate that the perpendicular arm excitation is attributed to that of the nonresonant parallel arm in the asymmetric structure which cannot keep the overall electric neutrality of the nanostructure, and thus, perpendicular arms are activated to maintain this balance.
机译：本文研究了非对称纳米交叉的特征，包括超短激光照射下的消光光谱，局部电场强度和局部电场的时间响应。发现，由于臂中与非对称纳米交叉的激光偏振方向垂直且平行的局部电场的同时激发，消光光谱显示出多个共振峰，并且可以通过改变峰的位置来调节峰的位置。手臂的长度。仿真结果表明，平行臂和垂直臂的光学响应之间存在很强的联系。此外，非对称纳米交叉臂中电场的时间响应表明，平行臂中的振荡开始于垂直臂中的振荡，并且当其中一个平行臂共振激发时，它们是同相的，这进一步反映了两者之间的关系。平行和垂直臂。因此，我们证明了垂直臂的激发归因于非对称结构中非共振平行臂的激发，不能保持纳米结构的整体电中性，因此，垂直臂被激活以维持这种平衡。

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