High-directivity radiation based on the leaky mode of spoof surface plasmon polaritons

Jin Jei Wu; Linfang Shen; Da Jun Hou; Yao-Huang Kao; Chien-Jang Wu; Jian Qi Shen; Tzong-Jer Yang

High-directivity radiation based on the leaky mode of spoof surface plasmon polaritons

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Author(s): Jin Jei Wu ¹ ; Linfang Shen ² ; Da Jun Hou ³ ; Yao-Huang Kao ¹ ; Chien-Jang Wu ³ ; Jian Qi Shen ⁴ ; Tzong-Jer Yang ¹
- Affiliations: 1: Department of Electrical Engineering, Chung Hua University, Hsinchu 30012, Taiwan;
  2: Institute of Space Science and Technology, Nanchang University, Nanchang 330031, People's Republic of China;
  3: Institute of Electro-Optical Science and Technology, National Taiwan Normal University, Taipei 116, Taiwan;
  4: State Key Laboratory of Modern Optical Instrumentations, Centre for Optical and Electromagnetic Research, Zhejiang University, Hangzhou 310058, People's Republic of China
Source: Volume 8, Issue 13, 21 October 2014, p. 1075 – 1079
DOI: 10.1049/iet-map.2013.0479 , Print ISSN 1751-8725, Online ISSN 1751-8733

Received 02/09/2013, Accepted 03/04/2014, Revised 06/03/2014, Published 15/05/2014

The guiding properties of spoof surface plasmon polaritons (SPPs) in an array of hollowed-out metallic blocks standing on a metallic surface are theoretically investigated in this study. For such spoof SPPs, there exists an additional guiding mode except for the fundamental mode and the former is closely related to hollowing out metal blocks. The dispersion band of this additional mode has a negative slope (corresponding to a group velocity) and it intersects the light line and then enters the radiation region as the frequency grows, which leads to a frequency steering pencil-like radiation. The transmission and radiation properties of the additional mode of spoof SPPs are finally verified experimentally.

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High-directivity radiation based on the leaky mode of spoof surface plasmon polaritons

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