Abstract
Spectral properties of metal–insulator–metal hole arrays consisting of a dielectric core layer sandwiched between two metallic layers drilled in rectangular hole arrays are investigated using the finite-difference time-domain method in the visible and near-infrared regions. The influences of the thickness and refractive index of the dielectric core layer as well as the thickness of the metallic layer on the spectral absorptance and transmittance are numerically studied. It is found that strong spectral absorption can be excited by the internal- and external-surface plasmon polaritons (SPPs). For some specific structure parameters, the metal–insulator–metal hole arrays show strong absorptance of the incident wave of about 95% if the internal- and external-SPPs are simultaneously excited.
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