Resonant Transmission of Electromagnetic Fields through Subwavelength Zero-$ε$ Slits

Details Resonant Transmission of Electromagnetic Fields through Subwavelength Zero-$ε$ Slits Resonant Transmission of Electromagnetic Fields through Subwavelength Zero-$ε$ Slits

2008-08-12

arxiv.org/abs/0808.1635v1

Phys. Rev. A 78, 021805 (2008)

Physics

Optics

Scientific paper

10.1103/PhysRevA.78.021805

We theoretically investigate the transmission of electromagnetic radiation through a metal plate with a zero-$\epsilon$ 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\'{e}rot-like resonances that have been observed in conductors with deep channels. We further reveal that these high impedance ultranarrow zero-$\epsilon$ channels can have significantly {\it greater} transmission compared to slits with no wave impedance difference across them.

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