Trapping of an electromagnetic wave by the boundary of created plasma |
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Authors: | M I Bakunov S N Zhukov |
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Institution: | (1) N. I. Lobachevskii Nizhnii Novgorod State University, 603600 Nizhnii Novgorod, Russia |
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Abstract: | We discuss a new phenomenon of the electrodynamics of transient media, the trapping of electromagnetic radiation by the boundary
of a transient plasma due to the conversion of the radiation into surface waves localized at the boundary. Calculations are
done for an initial plane wave and for a beam of finite width in conditions where the boundary of the suddenly created (because
of ionization) plasma half-space is perpendicular to the initial wavefront. Two frequency down-shifted surface waves traveling
along the boundary in opposite directions are shown to be excited, as well as frequency up-shifted outgoing radiation and
a time-independent mode in the form of a spatially inhomogeneous structure of dc currents and a magnetic field within the
plasma half-space. We study the associated kinematic, amplitude, and energy relations. Finally, we establish that the most
efficient trapping (up to 40% in energy) can be achieved with the forward (with respect to the direction of the initial wave
propagation) surface mode and that the trapping is accompanied by concentration of electromagnetic energy at the plasma boundary.
Zh. éksp. Teor. Fiz. 113, 1277–1288 (April 1998) |
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Keywords: | |
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