title: Properties of Transmission and Leaky Modes in a Plasmonic Waveguide Constructed by Periodic Subwavelength Metallic Hollow Blocks.
abstract: Based on the concept of low-frequency spoof surface plasmon polaritons (spoof SPPs), a kind of leaky mode is proposed in a waveguide made of a subwavelength metal-block array with open slots. Numerical results reveal that a new transmission mode is found in the periodic subwavelength metal open blocks. This modal field is located inside the interior of a hollow block compared with that in a solid metal block array. The dispersion curve shows that such a new SPPs mode has a negative slope, crossing the light line, and then going into a zone of leaky mode at higher frequencies. The leaky mode has a wider frequency bandwidth, and this can lead to a radiation scanning angle of 53° together with high radiation efficiency. Based on the individual characteristics exhibited by a frequency-dependent radiation pattern for the present leaky mode, the waveguide structure can have potential applications such as frequency dividers and demultiplexers. Experimental verification of such a leaky mode at microwave has been performed, and the experimental results are found to be consistent with the theoretical analysis.
authors.affiliation: Department of Electrical Engineering, Chung Hua University, Hsinchu 300, Taiwan.
authors.forename: Jin Jei
authors.initials: JJ
authors.lastname: Wu
authors.affiliation: Institute of Electro-Optical Science and Technology, National Taiwan Normal University, Taipei 116, Taiwan.
authors.forename: Chien Jang
authors.initials: CJ
authors.lastname: Wu
authors.affiliation: Centre for Optical and Electromagnetic Research, State Key Laboratory of Modern Optical Instrumentations, Zhejiang University, Hangzhou 310058, China.
authors.forename: Jian Qi
authors.initials: JQ
authors.lastname: Shen
authors.affiliation: Institute of Electro-Optical Science and Technology, National Taiwan Normal University, Taipei 116, Taiwan.
authors.forename: Da Jun
authors.initials: da J
authors.lastname: Hou
authors.affiliation: Department of Electrical Engineering, Chung Hua University, Hsinchu 300, Taiwan.
authors.forename: Wen Chen
authors.initials: WC
authors.lastname: Lo