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The excitation of hypersonic waves (f = 30–200 GHz) due to coupling with amplified space charge waves of millimeter wave range in GaN films is investigated theoretically. An amplification of space charge waves due to the negative differential conductivity in GaN films placed onto a semi-infinite substrate is considered and possible spatial increments are calculated. Both diffusion-drift equations...
Amplification of space charge waves (SCW) due to the negative differential conductivity in n-GaN films placed onto a semi-infinite substrate is investigated theoretically. A general case of transverse inhomogeneous films is considered. The diffusion-drift equations for volume electron concentration were used jointly with the Poisson equation for the electric field. The transverse inhomogeneity results...
Spatial amplification of millimeter wave range (f = 30 - 200 GHz) space charge waves in n-GaN films is investigated theoretically. An amplification is due to the negative differential conductivity in GaN films placed onto a semi-infinite substrate is considered and possible spatial increments are calculated. Both diffusion-drift equations for volume electron concentration and also an approximation...
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