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(a) Three-dimensional model of one-dimensionally arrayed subwavelength slits on thick metal film, which is assumed as a perfect conductor. (b) Transmittances (left axis) of a normal incident wave, analytically and numerically obtained, and effective refractive index (right axis), (light gray) and (dark gray), of the zeroth diffraction order according to frequency. (, , and .)
(a) Analytic dispersion curves of even mode (solid line) and odd mode (dashed line) and the corresponding transmittance of a normal incident wave. (b) Transmittances of even and odd modes according to along the dispersion curves. (, , and .)
Transverse field distribution of even [(a) and (c) ] and odd [(b) and (d) ] modes obtained from a FDTD simulation. The left and right figures correspond, respectively, to contour plots on the plane and plane of the metal film.
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