Enhanced off-resonance nonlinear properties of nm-thick layers of polyDCHD-HS on silver films

Year: 2003

Authors: Giorgetti E., Margheri G., Sottini S., Toci G., Muniz-Miranda M., Moroni L., Dellepiane G.

Autors Affiliation: Ist. di Fis. Applicata Nello Carrara, CNR, Via Panciatichi 64, Firenze 50127, Italy; Dipartimento di Chimica, Universitą di Firenze, Via della Lastruccia 3, Sesto Fiorentino 50019, Italy; Dipto. di Chim./Chimica Industriale, INFM, Universitą di Genova, Via Dodecaneso 31, Genova 16146, Italy

Abstract: A very large value of the intensity dependent refractive index was measured at 1064 nm with quasi-monomolecular layers of polyDCHD-HS spun on silver-coated plates and was related to the nanostructured surface of the silver films, which provides an electromagnetic mechanism for the enhancement of nonlinearity through local field effects. This point was confirmed in on-resonance (515 nm) and off-resonance (647 nm) SERS experiments. It is suggested that the experimental data can be accounted for by the existence of an interaction between the p-conjugated system of the polymer chain and the silver surface.

Journal/Review: LASER PHYSICS

Volume: 13 (2)      Pages from: 293  to: 297

KeyWords: Surface plasmon

Citations: 2
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