Berlin 2008 – scientific programme
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O: Fachverband Oberflächenphysik
O 18: Poster Session I - MA 141/144 (Atomic Wires; Size-Selected Clusters; Nanostructures; Metal Substrates: Clean Surfaces+Adsorption of Organic / Bio Molecules+Solid-Liquid Interfaces+Adsorption of O and/or H; Surface or Interface Magnetism; Oxides and Insulators: Clean Surfaces)
O 18.57: Poster
Monday, February 25, 2008, 18:30–19:30, Poster F
Non-linear Optical Properties of Nanostructured Metal Surfaces — •Heike Arnolds1, Natalia Garcia1, Simon J. Henley2, and J. David Carey2 — 1Surface Science Research Centre, University of Liverpool, Oxford Street, Liverpool, L69 3BX, UK — 2Nano-Electronics Centre, Advanced Technology Institute, School of Electronics and Physical Sciences, University of Surrey, Guildford GU2 7XH, UK
Nanosecond pulsed-laser irradiation of Ag and Ni thin films was employed to produce nanostructured Ag/SiO2 and Ni/SiO2 substrates. By tailoring the laser fluence, it is possible to controllably adjust the mean diameter of the resultant near-spherical metal droplets [1]. We have investigated the nonlinear optical properties of these nanostructured films and find a strong enhancement of femtosecond infrared-visible sum and difference frequency yields by two to three orders of magnitude, depending on the exact size and shape of the metal droplets. The likely cause of the enhancement is the excitation of plasmons in the infrared and visible regions of the spectrum and the concomitant electric field enhancement near the metal droplets. We discuss the use of these films for plasmon-enhanced photochemistry.
[1]S.J. Henley, J.D. Carey, and S.R.P. Silva, Appl. Phys. Lett. 88, 081904 (2006)