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(a) A SEM image for a typical sample laser machined on an aluminum plate. (b) Experimental setup. The angle dependent transmission spectra are measured by tilting the sample stage.
Geometry of a simple model system with rectangular-shaped slits. , , and are slit width, period, and sample thickness, respectively. The input THz wave is incident with a polarization along the axis.
Normalized transmission spectra at normal incidence for four samples with the slit width and period of 60 and respectively, but varying the sample thickness of 17, 40, 75, and , respectively.
Angle dependent transmission spectra for three samples with different thickness of 17 [(a) and (b)], 75 [(c) and (d)], and [(e) and (f)], respectively. (a), (c), and (e) show the experimental results; and (b), (d), and (f) theoretical calculations. White lines in (b) represent the surface plasmon polariton modes due to various diffraction orders, and white circles in (c) represent the crossing of the surface plasmon modes with the enhanced transmission.
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