Analysis of Spoof Surface Plasmonic Waveguides for Realizing THz Planar Circuits

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Khosrovani Moghaddam, Mohammad Ali | 2015

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 47669 (05)
University: Sharif University of Technology
Department: Electrical Engineering
Advisor(s): Ahmadi Boroujeni, Mehdi
Abstract:
The effect of dielectric cladding on the waveguiding characteristics of an array of metallic pillars on a metal plane in the terahertz band is explored. Firstly, the 2D structure made up of a metallic grating of infinite lateral width is studied analytically to get more insight into the problem. It is seen that by using dielectric cladding decaying length of the domino waveguide is less than one tenth of the wavelength in a frequency bandwidth.
Then the ideas inferred from the 2D structure are applied to the realistic 3D structure that has a finite lateral width. It is shown that by proper design of the dielectric medium surrounding the metallic pillars the modal field confinement can be enhanced in a broad frequency band resulting in a low bending loss. Especially, by evacuating the spaces between the pillars while covering them by a finite layer of high-resistivity silicon a highly confined spoof surface plasmon is supported and a considerable reduction in the bending loss over a broad bandwidth is observed
Keywords:
Terahertz Band ; Semiconductive Devices ; Domino Waveguide ; Spoof Plasmonic Waves ; Surface Plasmon Polariton

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