Abstract
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- sensing are proposed at microwave frequencies.
- Received 28 May 2008
DOI:https://doi.org/10.1103/PhysRevB.78.045102
©2008 American Physical Society