Enhancing the Dual-Band Guiding Capabilities of Coaxial Spoof Plasmons via use of Transmission Line Concepts
Miguel Navarro-Cía, Miguel Beruete, Mario Sorolla, Stefan A. Maier
Volume: 6, Issue: 2, June 2011
Spoof plasmons, Surface impedance, Terahertz, Transmission line, Dual-band
We derive closed analytical forms for the response of coaxial spoof plasmons, aided by transmission line concepts under the effective complex surface impedance framework. This constitutes a powerful
platform to improve as well as to elucidate designs with enhanced performances. In particular, we propose a dualband spoof plasmon waveguiding geometry with the higher order slow-wave mode operating well below the regime governed by dispersion of periodic guides (Bragg reflections at Brillouin zone boundaries), that is, diffraction. The analysis is supported by eigen mode numerical
calculations. As an example in a waveguide device context, we demonstrate the dual-band planar routing ability of elliptical–coaxial cable-based spoof plasmons along a straight chain as well as a Y-splitter.
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