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(a) Schematic view of a perforated metallic film with nine unit cells. (b) The unit cell with the corresponding structural parameters and (c) the FIB image of a typical array of the structure (the lattice period is ). All samples are with a thickness .
Measured (a) and calculated (b) zero-order transmission spectra for -polarization. The solid lines correspond to a sample with the following parameters: , , , , and . Moreover, the dashed lines correspond to the referenced pure hole array without protuberance (with the same lattice period and hole size). The split transmission peaks are marked with the arrows.
Simulated electric field pattern on plane , for the split transmission peaks [marked by the arrows in Fig. 2(b)]. The bold solid arrow specifies the incident polarization (-polarization). The image covers a single period, and the black lines mark the profiles of the square holes and protuberances.
Measured (left column) and calculated (right column) zero-order transmission spectra for -polarization. In the first row, the length of the right protuberances is changed from 20 to 40 and 60 nm (from the left to the right), and the remaining parameters are fixed as , , , and . In the second row, the length of the left protuberances is changed from 0 to 20, 40, and 60 nm (from the left to the right), and the remaining parameters are fixed as , , , and .
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