Interplay between photonic and plasmonic modes in optical properties of silver-coated two dimensional colloidal crystals

摘要: We report on the unusually high optical transmitivity of silver coated two-dimensional colloidal crystals. Our sample consists of a 50 nm film deposited top regular array polystyrene spheres 400 diameter. Two-dimensional colloidal crystals were prepared according to drop-coating technique, and subsequently covered in silver film by thermal evaporation. Morphology crystal was checked means scanning electron microscopy. We measured transmission through composite metallo-dielectric films at normal also oblique incidence. Additional reflectance spectra surface enhanced Raman scattering are used understand optical/plasmonic properties the prepared nanostructure. Dependence spectral features incident angle suggests highly localized optical/plasmonic modes involved mechanism transmission.