Phys. Rev. B 78, 045102 (2008) [5 pages]Dielectric sensing in ϵ-near-zero narrow waveguide channelsReceived 28 May 2008; published 3 July 2008 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. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.78.045102
DOI:
10.1103/PhysRevB.78.045102
PACS:
41.20.Jb, 42.82.Et, 52.40.Db, 52.40.Fd
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