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Enhancing the Dual-Band Guiding Capabilities of Coaxial Spoof Plasmons via use of Transmission Line Concepts

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Abstract

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 dual-band 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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Acknowledgment

The authors are grateful to Dr. F. Falcone for useful ideas and discussion. This work has been supported by Spanish Government under contract Consolider “Engineering Metamaterials” CSD2008-00066 and by the US Air Force Office of Scientific Research (AFOSR). Miguel Navarro-Cía also acknowledges the exchange grant given by the European Science Foundation (ESF) within the framework of the ESF Activity entitled “New Approaches to Biochemical Sensing with Plasmonic Nanobiophotonics (PLASMON-BIONANOSENSE).”

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Authors and Affiliations

  1. Millimeter and Terahertz Waves Laboratory, Universidad Pública de Navarra, Campus Arrosadía, 31006, Pamplona, Spain

    Miguel Navarro-Cía, Miguel Beruete & Mario Sorolla

  2. Experimental Solid State Group, Physics Department, Imperial College London, London, SW7 2AZ, UK

    Miguel Navarro-Cía & Stefan A. Maier

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  1. Miguel Navarro-Cía
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  2. Miguel Beruete
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  3. Mario Sorolla
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  4. Stefan A. Maier
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Correspondence to Miguel Navarro-Cía.

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Navarro-Cía, M., Beruete, M., Sorolla, M. et al. Enhancing the Dual-Band Guiding Capabilities of Coaxial Spoof Plasmons via use of Transmission Line Concepts. Plasmonics 6, 295–299 (2011). https://doi.org/10.1007/s11468-011-9203-x

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  • DOI: https://doi.org/10.1007/s11468-011-9203-x

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