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Proceedings Paper

Multiphoton evanescent wave spectroscopy and dynamics
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Paper Abstract

Non-intrusive laser-spectroscopical methods for the diagnostics of the gas-surface interaction in the near-field of a dielectric surface have been developed both experimentally and theoretically. The techniques base on either two-photon evanescent wave excitation or combined evanescent-volume wave excitation. Spectra obtained for sodium atoms at a glass-vacuum interface are quantitatively reproduced by a rigorous theoretical approach. In the case of pure evanescent wave excitation the excitation conditions can be chosen such that either the velocity distribution of desorbing atoms is determined or that atom-surface interaction parameters (polarizability of the adsorbed atoms, desorption rate, sticking coefficient) are obtained from the Autler- Townes splitting of the two-photon lines. By the use of combined evanescent-volume wave excitation one is able to distinguish optically between different groups of atoms interacting with the surface and one can extract their two- dimensional velocity distributions. In addition, information is obtained about superelastic scattering of the atoms interacting with the dielectric substrate.

Paper Details

Date Published: 5 December 2001
PDF: 11 pages
Proc. SPIE 4456, Controlling and Using Light in Nanometric Domains, (5 December 2001); doi: 10.1117/12.449526
Show Author Affiliations
Vladimir G. Bordo, General Physics Institute (Russia)
Horst-Guenter Rubahn, Univ. of Southern Denmark/Odense (Denmark)

Published in SPIE Proceedings Vol. 4456:
Controlling and Using Light in Nanometric Domains
Aaron Lewis; H. Kumar Wickramasinghe; Katharina H.B. Al-Shamery, Editor(s)

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