Abstract
We report here on the optical properties of silver films deposited on two-dimensional colloidal crystals. The structure exhibits unusual transmission spectra which resemble the enhanced optical transmission of periodic arrays of subwavelength holes in metal films. By taking into account combined experimental data from transmittivity, reflectivity and surface-enhanced Raman spectra (SERS), we explain the transmission behaviour as a result of strong radiative scattering and coupling between plasmon modes localized at the edge of silver caps and truncated tetrahedral particles.
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