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Understanding plasmonic properties and surfaceenhanced Raman scattering of silver coated colloidal crystals

C. FARCAU1,* , S. ASTILEAN1

Affiliation

  1. Nanobiophotonics Laboratory, Institute for Interdisciplinary Experimental Research and Faculty of Physics, Babes-Bolyai University, M. Kogalniceanu 1, 400084 Cluj-Napoca, Romania

Abstract

Two-dimensional colloidal crystals were prepared according to the drop-coating technique, and subsequently covered in a silver film by thermal evaporation. Light transmission through the composite metallo-dielectric film was measured at normal and also oblique incidence. We found that silver coated two-dimensional colloidal crystals exhibit unusually high optical transmitivity, which can be related to the extraordinary optical transmission phenomenon. Additional reflectance spectra and surface enhanced Raman scattering are used to understand the optical/plasmonic properties of the prepared nanostructure. Measured reflectivity minimum suggests plasmonic activity at wavelengths different than those of transmission maximum, this giving a preliminary understanding on the transmission mechanism..

Keywords

Colloidal crystals, Extraordinary optical transmission, Surface plasmons, Surface enhanced Raman scattering.

Submitted at: Nov. 15, 2006
Accepted at: March 15, 2007

Citation

C. FARCAU, S. ASTILEAN, Understanding plasmonic properties and surfaceenhanced Raman scattering of silver coated colloidal crystals, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 3, pp. 772-775 (2007)