http://www.cnr.it/ontology/cnr/individuo/prodotto/ID168552
Optical Characterization of Quasi-monomolecular Layers of the Nonlinear Polymer polyDCHD-HS (Articolo in rivista)
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- Label
- Optical Characterization of Quasi-monomolecular Layers of the Nonlinear Polymer polyDCHD-HS (Articolo in rivista) (literal)
- Anno
- 2002-01-01T00:00:00+01:00 (literal)
- Alternative label
Giorgetti E., Margheri G., Sottini S., Toci G., Muniz-Miranda M., Moroni L., Dellepiane G. (2002)
Optical Characterization of Quasi-monomolecular Layers of the Nonlinear Polymer polyDCHD-HS
in PCCP. Physical chemistry chemical physics (Print)
(literal)
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- Giorgetti E., Margheri G., Sottini S., Toci G., Muniz-Miranda M., Moroni L., Dellepiane G. (literal)
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- The huge nonlinear susceptibility that characterizes polyDCHD-HS as it adheres to silver as a thin layer is related to the giant local field fluctuations which have been theoretically predicted for metal/dielectric composites. Our tests also proved that polyDCHD-HS films on silver undergo Raman enhancement by more than one order of magnitude.. It suggest a striking correlation between SERS efficiency and nonlinear effects. A deeper understanding of these phenomena is expected as soon as single molecule investigation will be accessible in our laboratory. The development of nanotechnologies also suggests that it will eventually possible to exploit the giant nonlinearities observed in metal based nanostructures charcterized by photonic band gap properties (literal)
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- 1 IFAC-CNR;
2 Dip. di Chimica, Università di Firenze;
3 Dip. di Chimica e Chimica Industriale, Università di Genova. (literal)
- Titolo
- Optical Characterization of Quasi-monomolecular Layers of the Nonlinear Polymer polyDCHD-HS (literal)
- Abstract
- The nonlinear optical properties of quasi-monomolecular layers of polyDCHD-
HS spun on silver-coated plates were measured by Surface Plasmon
spectroscopy at 1064 nm and with ps pulses. A surprisingly large value of
chi(3) was obtained (Abs(Chi(3)) > 10-17 m2/V2). This value was related
with 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. The interaction of the pconjugated system of the
polymer chain with the silver surface is proposed to account for the
experimental data. (literal)
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