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Chin. Phys. B, 2022, Vol. 31(5): 054101    DOI: 10.1088/1674-1056/ac3503
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

Switchable directional scattering based on spoof core—shell plasmonic structures

Yun-Qiao Yin(殷允桥), Hong-Wei Wu(吴宏伟), Shu-Ling Cheng(程淑玲), and Zong-Qiang Sheng(圣宗强)
School of Mechanics and Photoelectric Physics, Anhui University of Science and Technology, Huainan 232001, China
Abstract  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.
Keywords:  spoof core-shell plasmonic structures      directional scattering      switchable direction  
Received:  28 September 2021      Revised:  21 October 2021      Accepted manuscript online: 
PACS:  41.20.Jb (Electromagnetic wave propagation; radiowave propagation)  
  42.25.Bs (Wave propagation, transmission and absorption)  
  41.85.-p (Beam optics)  
  78.20.Bh (Theory, models, and numerical simulation)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No.11904008),the Natural Science Foundation of Anhui Province,China (Grant No.1908085QA21),and the China Postdoctoral Science Foundation (Grant No.2019M662132).
Corresponding Authors:  Hong-Wei Wu,E-mail:hwwu@aust.edu.cn     E-mail:  hwwu@aust.edu.cn
About author:  2021-11-1

Cite this article: 

Yun-Qiao Yin(殷允桥), Hong-Wei Wu(吴宏伟), Shu-Ling Cheng(程淑玲), and Zong-Qiang Sheng(圣宗强) Switchable directional scattering based on spoof core—shell plasmonic structures 2022 Chin. Phys. B 31 054101

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