Premium
Parametric Conversion of an Electromagnetic Wave into an Acoustic Wave in Magnetised Cubic Piezoelectric Semiconducting Plasmas
Author(s) -
Ghosh S.,
Saxena R. B.
Publication year - 1984
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221210225
Subject(s) - physics , optics , dispersion relation , plane wave , wave propagation , electric field , electromagnetic radiation , piezoelectricity , condensed matter physics , computational physics , acoustics , quantum mechanics
A detailed analytical investigation is made of parametric conversion of an electromagnetic wave into an acoustic wave in a magnetoactive n‐type cubic piezoelectric semiconducting crystal belonging to class 4 3m under a geometrical configuration which can also be employed in analysing the phenomenon under either Voigt or Faraday orientation. The electric vector E 0 of an spatially uniform pump electromagnetic wave (applied along the y ‐axis) is normal to propagation direction (along the z ‐axis) of the generated low‐frequency transverse‐acoustic wave (Ω, k ) and the scattered electromagnetic wave (Ω 1 , k 1 ). The magnetostatic field is applied in the xz plane making an arbitrary angle θ with propagation vectors k, k 1 (antiparallel to each other). The dispersion relation is obtained by using a hydrodynamic model of an homogeneous, piezoelectric, one‐component (electron) semiconductor plasma, and the threshold value of pump electric field and the growth rate of unstable acoustic mode well above the threshold are discussed for isotropic ( B 0 = 0) and magnetoactive ( B 0 ≠ 0) plasmas. The analysis is applied to a specific semiconductor, n‐InSb at 77 K duly irradiated by a pulsed 10.6 μm CO 2 laser for numerical estimation. The laser wave intensities used are in the range of 10 9 to 10 11 W m −2 which is assumed to be less than the damage threshold of the InSb crystal.