Phononic dispersion of a two-dimensional chessboard-patterned bicomponent array on a substrate

V. L. Zhang, C. G. Hou, H. H. Pan, F. S. Ma, M. H. Kuok, H. S. Lim, S. C. Ng, M. G. Cottam, M. Jamali, H. Yang

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Brillouin measurements of the dispersion relations of surface acoustic- and optical-like waves along Γ-M and Γ-X symmetry directions in a two-dimensional bicomponent nanostructured crystal are reported. The sample, in the form of a periodic chessboard array of alternating Permalloy and cobalt square dots on a SiO 2/Si substrate, was fabricated using high-resolution electron-beam lithographic, sputtering, etching, and lift-off techniques. The measured phononic band structures exhibit diverse features, such as a partial hybridization bandgap and unusual surface optical-like phonon branches, where there are out-of-phase vibrational characteristics between nearest-neighbor dots. Numerical simulations, based on the finite element analysis, reproduced the experimental dispersion relations.

Original languageEnglish (US)
Article number053102
JournalApplied Physics Letters
Issue number5
StatePublished - Jul 30 2012
Externally publishedYes

Bibliographical note

Funding Information:
This project was funded by the Ministry of Education, Singapore under Grant R144-000-282-112, and the Singapore National Research Foundation under CRP Award No. NRF-CRP 4-2008-06.


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