Abstract
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.
Highlights
The electromagnetic radiation of terahertz range (THz) is widely used in spectroscopy, medicine, scanning, and environmental science [1]
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 superheterodyne amplification in the optical range and in the upper part of the terahertz range can be realized in waveguides on the base of n-GaN, n-InN films in two different geometries of the resonant three-wave interaction between two electromagnetic waves with the space charge wave
Summary
The electromagnetic radiation of terahertz range (THz) is widely used in spectroscopy, medicine, scanning, and environmental science [1]. An alternative way can be realized with the amplification of electromagnetic waves (EMW) under three-wave resonant interactions in semiconductor films where the negative differential conductivity (NDC) occurs. This method is based on the transfer of amplification of a space charge wave (SCW) at the microwave range or the lower part of THz range [2] to EMW at higher frequencies [3] [4]. The superheterodyne amplification takes place both in the collinear geometry, where the propagating EM modes and the SCW propagate in the same direction, and in the anti-collinear one, where the pump EMW at the intermediate frequency propagates in the opposite direction. An influence of the finite widths of EM waves in the plane of the film has been taken into account
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