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Proceedings Paper

Interplay between photonic and plasmonic modes in optical properties of silver-coated two dimensional colloidal crystals
Author(s): Cosmin Farcau; Adrian Kuttesch; Traian Petrisor; Lucian Barbu-Todoran; Constantin Craciun; Simion Astilean
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Paper Abstract

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

Paper Details

Date Published: 1 August 2007
PDF: 8 pages
Proc. SPIE 6785, ROMOPTO 2006: Eighth Conference on Optics, 678518 (1 August 2007); doi: 10.1117/12.757915
Show Author Affiliations
Cosmin Farcau, Babes-Bolyai Univ. (Romania)
Adrian Kuttesch, Babes-Bolyai Univ. (Romania)
Traian Petrisor, Technical Univ. Cluj-Napoca (Romania)
Lucian Barbu-Todoran, Babes-Bolyai Univ. (Romania)
Constantin Craciun, Babes-Bolyai Univ. (Romania)
Simion Astilean, Babes-Bolyai Univ. (Romania)


Published in SPIE Proceedings Vol. 6785:
ROMOPTO 2006: Eighth Conference on Optics

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