Tunneling of Electromagnetic Energy through Subwavelength Channels and Bends using ε-Near-Zero Materials

Mário Silveirinha and Nader Engheta
Phys. Rev. Lett. 97, 157403 – Published 10 October 2006

Abstract

In this Letter, we demonstrate theoretically that electromagnetic waves can be “squeezed” and tunneled through very narrow channels filled with ε-near-zero (ENZ) materials. We show that the incoming planar wave front is replicated at the output interface, independently of the specific geometry of the channel. A closed analytical formula is derived for the scattering parameters of a particular class of geometries. It is discussed that in some cases the isotropy of the ENZ material may not be an issue. A metamaterial realization of an anisotropic ENZ material is suggested and numerically studied.

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  • Received 23 March 2006

DOI:https://doi.org/10.1103/PhysRevLett.97.157403

©2006 American Physical Society

Authors & Affiliations

Mário Silveirinha* and Nader Engheta

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

  • *On sabbatical leave from Instituto de Telecomunicações, Universidade de Coimbra, Portugal.
  • To whom correspondence should be addressed. Electronic address: engheta@ee.upenn.edu

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Issue

Vol. 97, Iss. 15 — 13 October 2006

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