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

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タイトル: Acoustic-phonon cavity modes in one-dimensional multilayered elastic structures
著者: Tamura, Shin-ichiro 著作を一覧する
Watanabe, Haruka 著作を一覧する
Kawasaki, Takashi 著作を一覧する
発行日: 2005年
出版者: American Physical Society
誌名: PHYSICAL REVIEW B
巻: 72
開始ページ: 165306
出版社 DOI: 10.1103/PhysRevB.72.165306
抄録: 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
Relation (URI): http://www.aps.org/
資料タイプ: article
URI: http://hdl.handle.net/2115/5915
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 田村 信一朗

 

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