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Experimental Verification of Displacement-Current Conduits in Metamaterials-Inspired Optical Circuitry

Brian Edwards and Nader Engheta
Phys. Rev. Lett. 108, 193902 – Published 7 May 2012
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Abstract

Electric displacement current is present in capacitors and optical waveguides; however, unlike the conduction current in metallic wires, it is not confined. Analogous to the contrast in conductivity between a metallic wire and the surrounding air, displacement-current wires based on near-zero permittivity media contain a large contrast in effective permittivity. As a variation on this idea, in this Letter, we demonstrate at microwave frequencies two displacement-current cables based on effectively negative and effectively positive permittivity metastructures. Our experimental results clearly show cablelike behaviors that allow bending of the structure while still confining and maintaining the primarily longitudinal forward and reverse effective displacement currents within each conduit. The results presented here experimentally verify the notion of displacement-current wires and cables in metatronics as metamaterial-inspired circuitry.

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  • Received 2 November 2011

DOI:https://doi.org/10.1103/PhysRevLett.108.193902

© 2012 American Physical Society

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Wiring Up Displacement Currents

Published 7 May 2012

Specially designed waveguides act like conduits for high-frequency displacement currents.

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Authors & Affiliations

Brian Edwards and Nader Engheta*

  • Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA

  • *To whom correspondence should be addressed. engheta@ee.upenn.edu

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Issue

Vol. 108, Iss. 19 — 11 May 2012

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