Abstract
Acoustic-wave emission of two-dimensional plasmons in a semiconductor or superconductor microstructure is investigated using the phenomenological deformation potential within the jellium model. The plasmons are excited by the external electromagnetic (e.m.) field. The power conversion coefficient of e.m. energy into acoustic-wave energy is also estimated. It is shown that the coherent transformation has a sharp resonance at the plasmon frequency of the two-dimensional electron gas (2DEG). The incoherent transformation of the e.m. energy is generated by ohmic dissipation of the 2DEG. The method proposed for coherent-phonon-beam generation can be very effective for a high-mobility 2DEG and for thin superconducting layers if the plasmon frequency \ensuremath{\omega} is smaller than the superconducting gap 2\ensuremath{\Delta}.
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