Nonlinear mode coupling and internal resonance observed in a dusty plasma
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Ding, Zhiyue
Qiao, Ke
Ernst, N.
Kong, Jie
Chen, M.
Matthews, L.S.
Hyde, T. W.
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New Journal of Physics
Abstract
In this paper, we report the first experimental observation of internal resonance in a dusty plasma, which shows the intrinsic nonlinearities of dust interactions in plasmas. When driving a system of vertically aligned dust particle pairs in the vertical direction, the horizontal motion is found to be excited during onset of internal resonance when the higher-frequency horizontal sloshing mode is nonlinearly coupled to the vertical breathing mode through the 1:2 commensurable relation. A theoretical model of the nonlinear interaction of dust particles in plasma is also provided and the results of the theoretical model are shown to match experimental observations.
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New Journal of Physics, 21, 103051, October, 2019