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Simulated transmission spectra for an infinite microarray and the corresponding unit surface current density (, A/m) plots at 0.55 THz. (a) A 2D microarray of square panels with a unit length of and a air insulation between adjacent panels. Each panel had a hollow square window. (b) A two-layer stacked microarray with the same layer geometry as shown in (a), and a separation of between layers. (c) A microarray of cubes with unit lengths of and a hollow square window centered on each face. Cubes were separated by a air insulation. Shorted microarrays; these arrays are identical to those in (a)–(c), respectively, except that the units are separated by a air insulation. The scale bar shows the magnitude of with “h” being high and “l” being low.
2D templates were self-assembled into (a) cubes or (b) parallelepipeds and then coated with Au. (c) Microarrays of polyhedra coated with a hydrophobic polymer were assembled by agitation in water. (d) Optical image of microarrays composed of cubes and parallelepipeds. Also shown are zoomed-in images of an array composed of (e) cubes and (f) parallelepipeds with images of a single unit in each inset.
Experimental and simulated transmission spectra. [(a) and (b)] Normalized transmission spectra of a microarray composed of cubes and parallelepipeds, respectively. The inset depicts the simulated surface current loop in 3D on individual units. The notation “F,” “B,” “T,” and “L” in the inset of (a) indicates the front, back, top, and left face of the cubic unit.
Simulated transmission spectra with varying (a) cube spacing and (b) number of cube layers with a spacing. [(c)–(d)] Frequency and transmission amplitude of the dominant transmission peak with varying cube length and window size .
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