Surface Oscillations in Overdense Plasmas Irradiated by Ultrashort Laser Pulses

Details Surface Oscillations in Overdense Plasmas Irradiated by Ultrashort Laser Pulses Surface Oscillations in Overdense Plasmas Irradiated by Ultrashort Laser Pulses

2001-05-07

arxiv.org/abs/physics/0105019v3

Phys. Rev. Lett. 87, 205004 (2001)

Physics

Plasma Physics

9 pages (LaTeX, Revtex4), 4 GIF color figures, accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.87.205004

The generation of electron surface oscillations in overdense plasmas irradiated at normal incidence by an intense laser pulse is investigated. Two-dimensional (2D) particle-in-cell simulations show a transition from a planar, electrostatic oscillation at $2\omega$, with $\omega$ the laser frequency, to a 2D electromagnetic oscillation at frequency $\omega$ and wavevector $k>\omega/c$. A new electron parametric instability, involving the decay of a 1D electrostatic oscillation into two surface waves, is introduced to explain the basic features of the 2D oscillations. This effect leads to the rippling of the plasma surface within a few laser cycles, and is likely to have a strong impact on laser interaction with solid targets.

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