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Dielectric sensing in ε-near-zero narrow waveguide channels
Departmental Papers (ESE)
  • Andrea Alù, University of Pennsylvania
  • Nader Engheta, University of Pennsylvania
We exploit here the dramatic field enhancement caused by energy squeezing and tunneling i.e., "supercoupling" in metamaterial-inspired ultranarrow waveguide channels with near-zero effective permittivity in order to sense small permittivity variations in a tiny object. The supercoupling effect is accurately modeled analytically and closed-form expressions are derived to describe the presence of defects or permittivity perturbations along the channel. Applications for tailoring its pass-band frequency and for high-Q sensing are proposed at microwave frequencies.
Document Type
Journal Article
Date of this Version
Copyright 2008 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. Reprinted in Physical Review B, Volume 78, Article 045102, July 2008.
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  • metamaterials,
  • optical sensors,
  • optical squeezing,
  • optical waveguides,
  • permittivity,
  • tunnelling
Citation Information
Andrea Alù and Nader Engheta. "Dielectric sensing in ε-near-zero narrow waveguide channels" (2008)
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