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Gap offset distance, array number and period dependences of the developed meta structures. The calculated (a,b) measured reflectance spectra of meta-structures with changing offset distance from 0 µm to 20 µm with a step of 2 µm and 5 µm, respectively. The array number and period are fixed at 5 × 5 and 100 µm, respectively. The calculated (c) and measured (d) reflectance spectra of meta-structures with different arrays and periods.
