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Acoustic-phonon cavity modes in one-dimensional multilayered elastic structures

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Title: Acoustic-phonon cavity modes in one-dimensional multilayered elastic structures
Authors: Tamura, Shin-ichiro1 Browse this author →KAKEN DB
Watanabe, Haruka Browse this author
Kawasaki, Takashi Browse this author
Authors(alt): 田村, 信一朗1
Issue Date: 2005
Publisher: American Physical Society
Volume: 72
Start Page: 165306
Publisher DOI: 10.1103/PhysRevB.72.165306
Abstract: We theoretically study "cavity" phonons, i.e., acoustic phonons localized in a foreign layer (a cavity layer) embedded in a periodic one-dimensional superlattice (SL) in the isotropic, continuum approximation. To find the eigenfrequencies of the cavity modes we develop a formulation based on the transfer matrix and Green's function methods and apply it to the case where the confined phonons propagate along the layer interfaces. These cavity phonons are predicted to exist for both the coupled longitudinal and transverse acoustic mode (the sagittal mode) and the single mode with pure transverse polarization (the shear-horizontal mode). Numerical examples are presented for periodic Al/W multilayered structures with a Ag cavity layer and GaAs/AlAs SLs with an Al0.8Ga0.2As layer. Finite-difference time-domain calculations for phonon packet propagation are also conducted to directly illustrate the existence of the confined cavity modes and also to confirm the validity of our formulation.
Rights: Copyright © 2005 American Physical Society
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 田村 信一朗

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