a1 Faculty of Physics and Astronomy, Ruhr University Bochum, D-44780 Bochum, Germany (firstname.lastname@example.org)
a2 Department of Physics, Umeå University, SE-90187 Umeå, Sweden
a3 School of Physics, University of KwaZulu-Natal, Durban 4000, South Africa
a4 Department of Physics (IFM), Linkoping University, Sweden
The nonlinear coupling between high-frequency surface plasmons (SPs) and low-frequency ion oscillations on metallic plasma surfaces with charged nanoparticles is considered. It is shown that a finite-amplitude SP wave is modulationally unstable against the excitation of non-resonant ion oscillations. The growth rates and thresholds of the modulational instabilities are presented.
(Received November 03 2007)
(Accepted November 19 2007)
(Online publication January 08 2008)