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

Cosmin Farcau; Adrian Kuttesch; Traian Petrisor; Lucian Barbu-Todoran; Constantin Craciun; Simion Astilean

doi:10.1117/12.757915

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1 August 2007 Interplay between photonic and plasmonic modes in optical properties of silver-coated two dimensional colloidal crystals

Cosmin Farcau, Adrian Kuttesch, Traian Petrisor, Lucian Barbu-Todoran, Constantin Craciun, Simion Astilean

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Proceedings Volume 6785, ROMOPTO 2006: Eighth Conference on Optics; 678518 (2007) https://doi.org/10.1117/12.757915
Event: ROMOPTO 2006: Eighth Conference on Optics, 2006, Sibiu, Romania

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.

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Cosmin Farcau, Adrian Kuttesch, Traian Petrisor, Lucian Barbu-Todoran, Constantin Craciun, and Simion Astilean "Interplay between photonic and plasmonic modes in optical properties of silver-coated two dimensional colloidal crystals", Proc. SPIE 6785, ROMOPTO 2006: Eighth Conference on Optics, 678518 (1 August 2007); https://doi.org/10.1117/12.757915

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