We measured IR-visible sum-frequency generation spectra of CH3-(C6H4)(2)-(CH2)(3)-S-H (Biphenyl-3) self-assembled monolayers on a silver and a gold substrate. For the latter substrate, we observed different interference patterns between the resonant signal of the CH vibration and the non-resonant contribution of the substrate as a function of the visible beam wavelength. The non-linear response of the gold substrate is enhanced around 480 nm corresponding to the s-d interband transition. Such effect is not observed for the silver substrate the interband transition of which is located out of the investigated visible spectral range of 450-700 nm.
|Pages (de - à)||203-207|
|Nombre de pages||5|
|Etat de la publication||Publié - 2002|