Spectral properties of metal/insulator/metal (MIM) structure with two-dimensional-hole arrays (2DHAs) are investigated by using the finite-difference time-domain (FDTD) method. The effects of the period, the hole ratio, the thickness of front layer and core layer, and the incident angle as well as the polarization angle on the spectral properties of structured surfaces are studied. It is found that extraordinary optical transmission (EOT) can be excited by the combined effect of waveguide cutoff function and surface plasmon polaritons (SPPs). For some special structure parameters, the MIM structure shows strong absorption of incident wave due to odd mode of SPPs and Fabry–Pe´rot resonance at the sub-wavelength region and relatively longer wavelength region, respectively. These results provide guide information for the application of MIM structure to the EOT devices, absorbers or radiators.

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