Abstract
This paper is concerned with the scattering and field enhancement of a narrow slit perforated in a slab of perfect conductor. We demonstrate that the enhancement of the electromagnetic field for such a configuration can be induced by either Fabry--Perot type scattering resonances or a certain nonresonant effect in the quasi-static regime. We derive the asymptotic expansions of Fabry--Perot type resonances and quantitatively analyze the field enhancement at the resonant frequencies, for which both the enhancement order and the shapes of resonant modes are precisely characterized. The field enhancement at nonresonant frequencies in the quasi-static regime is also investigated. It is shown that the fast transition of the magnetic field in the slit induces strong electric field enhancement.
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