Acoustic phonons in a piezoelectric [111] GaAs/AlAs superlattice

Dispersion, transmission (T), and reflection (R) properties of acoustic phonons in a [111] GaAs/AlAs superlattice are numerically investigated. Both classical dispersion curves and Floquet slowness diagrams are given to show the edges of the Brillouin zones. Locations and widths of the stop bands in...

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Bibliographic Details
Main Authors: Zhang, V.Y., Lefebvre, J.E., Gryba, T.
Format: Conference Proceeding
Language:English
Subjects:
Acoustic reflection
Couplings
Dispersion
Filtering
Frequency
Gallium arsenide
Genetic expression
Phonons
Polarization
Superlattices
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Summary:Dispersion, transmission (T), and reflection (R) properties of acoustic phonons in a [111] GaAs/AlAs superlattice are numerically investigated. Both classical dispersion curves and Floquet slowness diagrams are given to show the edges of the Brillouin zones. Locations and widths of the stop bands inside the folded zones, as well as T- and R-rates, are studied as a function of frequency and incident angle. General expressions for T- and R-rates are derived, including mode conversion. Due to interaction between modes, T and R rates exceed unity for certain frequencies.
ISSN:1051-0117
DOI:10.1109/ULTSYM.2000.922611