The origination of single-direction oriented asymmetric speckles has been experimentally discovered on illnminating the anisotropic surface of a metal face by a focused laser beam. This is due to a simultaneous resonance excitation of two modes of surface plasmonpolaritons connected in pairs. One mode is excited on a wavy surface of a semi-infinite metal reflection grating with a deep chaotic profile, the other, on a macroscopically straight edge of the grating, which is perpendicular to the grating profile grooves.
Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
$^1$Department of General Physics
$^2$Department of Radiophysics
$^3$Department of Physical Electronics
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