Figure 1.

Dual-periodical multilayer structure. Schematic view of the 1D dual-periodic structure showing the layer parameters, where n and m represent the period numbers of a and b in A and B substructures, respectively; n1 and n2 are high and low refractive indexes of alternating dielectric layers in a and b; the layer thickness is d1 and d2 for a, and d3 and d4 for b, respectively.

Estevez et al. Nanoscale Research Letters 2012 7:413   doi:10.1186/1556-276X-7-413
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