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Excitation of volume plasmon polaritons in metal-dielectric metamaterials using 1D and 2D diffraction gratings

We report on the excitation of volume plasmon polaritons (VPPs) in multilayered Au/SiO2 metamaterials using the grating coupling principle. Here, VPPs represent the high-k propagating waves inside the multilayered Au/SiO2 structure. Properly designed one- and two-dimensional (1D and 2D) metallic diffraction gratings have been used to excite and probe VPPs at optical frequencies in a wide spectral region, ranging from visible to near infrared. It is inferred that 2D gratings provide enhanced excitation of VPP modes in comparison to 1D gratings. The observed experimental results are then compared with calculations obtained through modal index analysis and the scattering matrix method.