Journal
APPLIED PHYSICS LETTERS
Volume 100, Issue 6, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3684839
Keywords
energy gap; finite element analysis; phononic crystals; piezoelectric materials; piezoelectricity; surface acoustic waves
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Funding
- ANR [ANR-09-NANO-004 (phoXcry)]
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We demonstrate the existence of non-radiative complete surface acoustic wave (SAW) bandgaps for two-dimensional piezoelectric phononic crystals of holes. Holes of finite depth in a semi-infinite LiNbO3 substrate are specifically considered. SAW bandgaps are determined from the band structure calculated with a three-dimensional finite element method taking into account material anisotropy and piezoelectricity. The effect of hole geometry on the bandgaps has been investigated. It is further found that the complete band gap does not close for moderately conical holes. (C) 2012 American Institute of Physics. [doi: 10.1063/1.3684839]
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