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(Color online) Zero-order transmission spectra of samples (a) A, (b) B, (c) C, and (d) D with various hole periods of microcells arranged randomly. The lattice constants of the microcells are 3, 5, and 3, 5, and mixtures. The radius of each hole is . The Al thickness is .
(Color online) Transmission spectra of samples (a) A, (b) B, and (c) D obtained by rotating the sample about the direction of incident radiation.
SPP dispersion relations of sample B (white: SP modes).
Structural parameters and position of surface resonance for samples A, B, C, and D. (unit: ). x: the intensity of SP resonance is weak.
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