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Plural interactions of space charge wave harmonics during the development of two-stream instability

Chinese Physics B 2015年第9期24卷 332-336页

作者： Victor Kulish Alexander Lysenko Michael Rombovsky Vitaliy Koval Iurii Volk National Aviation University Department of Theoretical Physics Sumy State University Department of General and Theoretical Physics

We construct a cubically nonlinear theory of plural interactions between harmonics of the growing space charge wave（SCW） during the development of the two-stream instability. It is shown that the SCW with a wide frequency spectrum is formed when the frequency of the first SCW harmonic is much lower than the critical frequency of the two-stream *** SCW has part of the spectrum in which higher harmonics have higher amplitudes. We analyze the dynamics of the plural harmonic interactions of the growing SCW and define the saturation harmonic levels. We find the mechanisms of forming the multiharmonic SCW for the waves with frequencies lower than the critical frequency and for the waves with frequencies that exceed the critical frequency.

关键词： two-stream instability three-wave parametric resonances space charge wave free-electron laser

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Different Geometries of Superheterodyne Amplification of Electromagnetic Beams in waveguides Nitride-Dielectric

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Journal of Electromagnetic Analysis and Applications 2020年第11期12卷 159-168页

作者： Jesus Escobedo-Alatorre Volodymyr Grimalsky Svetlana Koshevaya Margarita Tecpoyotl-Torres Institute for Basic and Applied Research (IICBA) Center for Investigations on Engineering and Applied Science (CIICAp) Autonomous University of State Morelos (UAEM) Cuernavaca Mexico

The superheterodyne amplification of electromagnetic waves is investigated when the resonant three-wave interaction of two electromagnetic waves with the space charge wave occurs in the waveguides nitride n-GaN, n-InN films-dielectric. The amplification of SCW waves due to the negative differential conductivity is investigated in nitride n-GaN, n-InN films at the frequencies f ≤ 400 GHz in the lower part of the terahertz (THz) range. The electromagnetic waves are either in the upper part of THz range or in the optical range. The superheterodyne amplification is considered in two geometries, the collinear one in which the three interacting waves travel in the same direction and the anti-collinear geometry where the second electromagnetic wave propagates in the opposite direction. The preferences and drawbacks of each geometry are pointed out. The finite width of space charge waves leads to decrease of increments of amplification.

关键词： Superheterodyne Amplification Negative Differential Conductivity space charge wave Nitride Films Terahertz Range

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