23 research outputs found
Total absorption of an electromagnetic wave by an overdense plasma
We show both theoretically and experimentally that an electromagnetic wave
can be totally absorbed by an overdense plasma when a subwavelength diffraction
grating is placed in front of the plasma surface. The absorption is due to
dissipation of surface plasma waves (plasmons-polaritons) that have been
resonantly excited by the evanescent component of the diffracted
electromagnetic wave. The developed theoretical model allows one to determine
the conditions for the total absorption.Comment: To be published in PR
Electron Beam Instability in Left-Handed Media
We predict that two electron beams can develop an instability when passing
through a slab of left-handed media (LHM). This instability, which is inherent
only for LHM, originates from the backward Cherenkov radiation and results in a
self-modulation of the beams and radiation of electromagnetic waves. These
waves leave the sample via the rear surface of the slab (the beam injection
plane) and form two shifted bright circles centered at the beams. A simulated
spectrum of radiation has well-separated lines on top of a broad continuous
spectrum, which indicates dynamical chaos in the system. The radiation
intensity and its spectrum can be controlled either by the beams' current or by
the distance between the two beams.Comment: 4 pages, 4 figure
Resonant Plasmon-Soliton Interaction
We describe an effective resonant interaction between two localized wave
modes of different nature: a plasmon-polariton at a metal surface and a
self-focusing beam (spatial soliton) in a non-linear dielectric medium.
Propagating in the same direction, they represent an exotic coupled-waveguide
system, where the resonant interaction is controlled by the soliton amplitude.
This non-linear system manifests hybridized plasmon-soliton eigenmodes, mutual
conversion, and non-adiabatic switching, which offer exciting opportunities for
manipulation of plasmons via spatial solitons.Comment: 5 pages, 4 figures, to appear in Phys. Rev.