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(a) SEM images of the plasmonic structures perforated with different periods: 300, 400, 500, and from left to right. Measured and calculated transmission spectra at normal incidence for four samples with different periods, 300, 400, 500, and along x [(b) and (c)] and y [(d) and (e)] directions, respectively.
(a) The measured (black circles) and calculated (red squares) peak amplitudes at resonant frequencies. The measurements were carried out by using the samples with the varying from 300 to in an increment of . The perfect conductor model was applied for obtaining the theoretical results. (b) The area-normalized EF. (c) Simulated field distribution in the xy plane of a sample with periods of . The simulation was carried out at the resonant wavelength of . The incident polarization is along the x-axis.
Time-averaged Poynting vectors simulated at the resonant wavelength of for two different of 400 and , respectively. The polarization of the incident terahertz wave is along the x-direction.
The comparison between the calculated optimum and the resonant wavelengths obtained in the structures with the apertures of three different widths, 150, 200, and , respectively.
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