Photothermal Modulation of Propagating Surface Plasmons on Silver Nanowires,ACS Photonics

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Photothermal Modulation of Propagating Surface Plasmons on Silver Nanowires
ACS Photonics ( IF 6.5 ) Pub Date : 2019-06-25 00:00:00 , DOI: 10.1021/acsphotonics.9b00711
Qiang Li _{1,

2} , Li Chen ₃ , Hongxing Xu ₄ , Zhaowei Liu _{3,

5} , Hong Wei _{1,

6}

Affiliation

Nanoplasmonic devices have received much attention in recent years due to their ability to confine light beyond the diffraction limit. Manipulating the propagation of surface plasmons (SPs) is of vital importance for the creation of nanometer-scale integrated photonic devices. In this work we exploit the photothermal property of a silver nanowire (NW) to optically modulate the propagation of SPs on it. Under the excitation of a control laser beam, the rise of local temperature induced by the photothermal effect of silver NW results in the dramatic increase or decrease of the intensity of the transmitted SPs generated by a probe laser beam, depending on the Fabry-Pérot resonance conditions of the SPs on the NW. The amplitude of the photothermal modulation depth is found to be strongly dependent on the focal position, polarization, and power of the control beam. The simulations reveal that the high modulation depth at the NW end is mainly caused by the additional heat generated by the propagating SPs on the NW. The analytical solutions for the transmissivity and modulation depth are presented. Both numerical simulations and theoretical analysis agree well with the experimental results. Our work provides not only a new kind of all-optical modulation method for the propagating SPs in ultracompact plasmonic devices, but also the basic understanding about the influence of environmental temperature on the propagating SPs.

中文翻译：

银纳米线上传播的表面等离激元的光热调制。

近年来，由于纳米等离子设备能够将光限制在衍射极限之外，因此备受关注。操纵表面等离子体激元（SP）的传播对于创建纳米级集成光子器件至关重要。在这项工作中，我们利用银纳米线（NW）的光热特性来光学调制SP在其上的传播。在控制激光束的激发下，由NW银的光热效应引起的局部温度升高导致探测激光束产生的透射SP强度急剧增加或降低，具体取决于Fabry-Pérot共振NW上SP的条件。发现光热调制深度的幅度在很大程度上取决于焦点位置，偏振，和控制光束的功率。仿真表明，西北端的高调制深度主要是由于西北面上传播的SP产生的额外热量引起的。给出了透射率和调制深度的解析解。数值模拟和理论分析均与实验结果吻合良好。我们的工作不仅为超紧凑型等离激元器件中的传播SP提供了一种新型的全光调制方法，而且还提供了有关环境温度对传播SP的影响的基本理解。数值模拟和理论分析均与实验结果吻合良好。我们的工作不仅为超紧凑型等离激元器件中的传播SP提供了一种新型的全光调制方法，而且还提供了有关环境温度对传播SP的影响的基本理解。数值模拟和理论分析均与实验结果吻合良好。我们的工作不仅为超紧凑型等离激元器件中的传播SP提供了一种新型的全光调制方法，而且还提供了有关环境温度对传播SP的影响的基本理解。

更新日期：2019-06-25

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