Optical characterization of quasi-monomolecular layers of the nonlinear polymer polyDCHD-HS

Year: 2002

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

Autors Affiliation: IFAC-CNR, Via Panciatichi 64, Firenze, 50127, Italy; Dipartimento di Chimica, Universitą di Firenze, Via della Lastruccia 3, Sesto Fiorentino, 50019, Italy; INFM, INSTM and Dipartimento di Chimica e Chimica Industriale, Universitą di Genova, Via Dodecaneso 31, Genova, 16146, Italy

Abstract: The nonlinear optical properties of quasi-monomolecular layers of polyDCHD-HS spun on silver-coated plates were measured using surface plasmon spectroscopy at 1064 nm and with ps pulses. A surprisingly large value of x(3) was obtained (x(3) >10-17 m2 V-2). This value was related to the presence of the silver film, whose nanostructured surface provides an electromagnetic mechanism for the enhancement of the nonlinearity through local field effects. This point was confirmed by SERS experiments performed on-resonance (515 nm) and off-resonance (647 nm) on the same samples. 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: PHYSICAL CHEMISTRY CHEMICAL PHYSICS

Volume: 4 (12)      Pages from: 2762  to: 2767

KeyWords: Enhanced Raman-scattering; Langmuir-blodgett Monolayers; Small Metal Particles; Mode-locked Ti; Hyper-raman; Single-molecule; Surface-plasmon; Island Films; Silver; Sers
DOI: 10.1039/b111492c

Citations: 16
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