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(a) Schematic view of a dual structure made by combining two 2D square-lattice photonic crystals formed by metallic pillars. (b) Scanning electron microscopy image of the structure.
Transmission spectra for filters formed by two 2D square-lattice-based arrays consisting of four lines of metallic rods with a period of and with rod diameters and , respectively. The gap between the arrays are: (a) ; (b) ; (c) ; (d) . Experimental results are shown by solid lines and finite difference time domain numerical modeling results by dotted lines. The horizontal bars in Fig. 2(a) show the positions of the passbands for infinite periodic crystals with rod diameters (upper bars) and (lower bars).
Transmission spectra for a combined filter formed by two pillar arrays with a period of , containing metal rods with diameters and , respectively, and separated by a gap . The vertical length of the pillar is . The experimental spectrum is shown by the solid line and the numerical modeling results by the dotted line. The horizontal bars show the positions of the passbands for infinite periodic crystals with rod diameters (upper bars) and (lower bars).
Transmission spectra through the structure formed by four layers of pillars with rod diameters of 40, 50, 60, and , respectively. The rod center separation (period) is . Results of experimental measurements are shown by a solid line and numerical modeling by a dotted line.
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