(a) Schematic illustration of the double metallic slabs with periodic slit arrays. The upper and lower slabs are identical with the same geometrical parameters of height h, periodicity d, and slit width w. The gap length and the lateral displacement between the slabs are Δy and Δz, respectively. (b) A triple dielectric layer system corresponding to the configuration of (a). The effective refractive index and the thickness of the upper and the lower layers are n 1 = d/w and L 1 = h/n 1, respectively, while those for the middle layer are n 2 and L 2 = Δz, respectively.
Transmission spectra for three different alignments of the double metallic slabs with a thin air gap of 35 μm. The measured alignments are shown for each spectrum. Here, h = 1360 μm, d = 600 μm, and w = 160 μm. The red dots indicate experimental results, while the blue solid lines show fitted curves for n 1 = d/w = 3.75.
Effective refractive index n 2 of the air gap region as a function of the lateral shift Δy for various Δz values. The dots indicate experimental data, while the solid lines represent the theoretical predictions of Eq. (4) .
Calculated transmission at oblique incidence for double-layered cut-though arrays (dotted data) and corresponding triple dielectric layers (solid lines) with different lateral displacement Δy at 0.025 THz. The cut-through slit structure is the same as that in Fig. 2 . The refractive index of the dielectric layers is determined by Eq. (4) .
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