Dresden 2006 – wissenschaftliches Programm

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O: Oberflächenphysik

O 18: Nanostructures II

O 18.5: Vortrag

Dienstag, 28. März 2006, 12:15–12:30, PHY C213

Surface plasmon on sputtered Ag(110) measured by reflectance difference spectroscopy — •L.D. Sun, J.M. Flores-Camacho, M. Hohage, and P. Zeppenfeld — Institut of Experimental Physics, Johannes Kepler University Linz, Altenberger str. 69, A4040 Linz, Austria
The surface plasmon resonance on sputtered Ag(110) has been investigated by Reflectance Difference Spectroscopy (RDS). The Ag(110) clean surface was exposed to Ar ion bombardment and its effects on the optical anisotropic response were monitored by means of RDS. The spectra exhibit a pronounced peak around the established surface plasmon resonance at about 3.66 eV. We believe that this feature is induced by the well known rippled pattern formed by the Ar ion sputtering on the clean Ag(110)[1], whose periodicity along the [001] direction allows for the coupling of the dispersion relations of surface plasmon and light in an excitation grating mode. The effects of annealing at room temperature and sputtering with other ions (Ne, He) will be discussed as well.

[1] S. Rusponi, C. Boragno and U. Valbusa, Phys. Rev. Lett. 78, 2795 (1997).