Resonant Transmission of Electromagnetic Fields through Subwavelength Zero-ε Slits
Abstract
We theoretically investigate the transmission of electromagnetic radiation through a metal plate with a zero-ε metamaterial slit, where the permittivity tends towards zero over a given bandwidth. Our analytic results demonstrate that the transmission coefficient can be substantial for a broad range of slit geometries, including subwavelength widths that are many wavelengths long. This novel resonant effect has features quite unlike the Fabry-P\'erot-like resonances that have been observed in conductors with deep channels. We further reveal that these high impedance ultranarrow zero-ε channels can have significantly greater transmission compared to slits with no wave impedance difference across them.
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