Switchable directional scattering based on spoof core-shell plasmonic structures  

作　　者：Yun-Qiao Yin Hong-Wei Wu Shu-Ling Cheng Zong-Qiang Sheng 殷允桥;吴宏伟;程淑玲;圣宗强(School of Mechanics and Photoelectric Physics,Anhui University of Science and Technology,Huainan 232001,China)

机构地区：[1]School of Mechanics and Photoelectric Physics,Anhui University of Science and Technology,Huainan 232001,China

出　　处：《Chinese Physics B》2022年第5期274-279,共6页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.11904008);the Natural Science Foundation of Anhui Province,China(Grant No.1908085QA21);the China Postdoctoral Science Foundation(Grant No.2019M662132)。

摘　　要：Manipulating directional electromagnetic scattering plays a crucial role in the realization of exotic optical phenomenon.Here,we show that the spoof plasmonic structure is able to achieve the switching of directional scattering direction on a subwavelength scale by inserting a perfect electric conductor(PEC)cylinder into the hollow of the spoof plasmonic structure.Based on the modal analysis,it is found that the electromagnetic response of the core-shell structure not only is well excited,but also exhibits the directional scattering by interference between the electric and magnetic dipolar resonances.We also discuss the influence of PEC cylinder radius on the performance of the directional scattering.Finally,the active tunable directional scattering is realized by switching between the two states.This work provides a feasible pathway to the subwavelength manipulation of electromagnetic wave.Moreover,it offers a simple method to switch the directional scattering direction.The proposed design approach can be easily applied to digital electromagnetic wave communication and associated applications.

关 键 词：spoof core-shell plasmonic structures directional scattering switchable direction 

分 类 号：O53[理学—等离子体物理]