Article (Scientific journals)
Influence of the metal electronic properties on the sum-frequency generation spectra of dodecanethiol self-assembled monolayers on Pt (111), Ag (111) and Au (111) single crystals
Dreesen, Laurent; Humbert, Christophe; Celebi, M. et al.
2002In Applied Physics. B, Lasers and Optics, 74, p. 621-625
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Abstract :
[en] Infrared-visible sum-frequency generation (SFG) spectroscopy is performed at different visible wavelengths between 450 and 650 nm in order to investigate the interaction between metallic substrates (Pt, Ag and Au) and 1-dodecanethiol self-assembled monolayers. We show that such measurements provide a means to study the electronic properties of metals as well as the interference phenomena between the SFG signals from the adsorbate and the substrate. The common features of the three interfaces are the vibration modes of the terminal methyl groups. However, these resonances appear as peaks for Pt (111) and as dips in the case of Ag (111). Their shape is not modified when the visible wavelength is tuned between 450 and 650 nm. Moreover, the metal sum-frequency generation contribution is slightly modified in that spectral range. For Au (111) samples, the sum-frequency generation spectrum drastically evolves with the visible wavelength: the peak resonant sum-frequency generation signal at 450 nm becomes rather dip-shaped at 650 nm. The non-linear response of gold is also enhanced when the wavelength associated with the sum-frequency process is close to 480 nm. These results are interpreted on the basis of the metal electronic properties that are responsible for the non-resonant contribution to the SFG signal.
Disciplines :
Physics
Author, co-author :
Dreesen, Laurent ;  Université de Liège - ULiège > Département de physique > Biophotonique
Humbert, Christophe
Celebi, M.
Lemaire, J. J.
Mani, A. A.
Thiry, P. A.
Peremans, A.
Language :
English
Title :
Influence of the metal electronic properties on the sum-frequency generation spectra of dodecanethiol self-assembled monolayers on Pt (111), Ag (111) and Au (111) single crystals
Publication date :
2002
Journal title :
Applied Physics. B, Lasers and Optics
ISSN :
0946-2171
eISSN :
1432-0649
Publisher :
Springer Science & Business Media B.V., New York, United States - New York
Volume :
74
Pages :
621-625
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 26 October 2009

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