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Geometry of the problem. An I-shaped aperture is fabricated in a pyramidal structure on a metallic uniform screen of thickness . A narrow gap region of is sandwiched by two wide gap regions of in the cross section of the I-shaped aperture. The pyramidal structure is divided into two sections. The height of the left section is and the difference in height between the two sections is given by .
Two-dimensional optical intensity distributions on a plane parallel to the plane for an I-shaped aperture in a pyramidal structure for (a) and (b) , respectively. The intensity scale range normalized by incident intensity is 0–10. The white rectangle indicates the shape of the I-shaped aperture. Length scale of is shown by a vertical white line and incident polarization is shown by a horizontal white arrow. .
Total intensity distributions (a) on a line parallel to the axis at and (b) on a line parallel to the axis at for the distributions shown in Figs. 2(a) and 2(b). Open circles represent the results for obtained using discretized cubes of . Results of a simple square aperture on the flat screen of are also shown. .
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