Surface acoustic waves on a sphere with divergent, focusing, and collimating beam shapes excited by an interdigital transducer

Satoru Ishikawa; Noritaka Nakaso, R.; Nobuo Takeda, R.; Tsuyoshi Mihara, R.; Yusuke Tsukahara, R.; Kazushi Yamanaka, R.
December 2003
Applied Physics Letters;12/1/2003, Vol. 83 Issue 22, p4649
Academic Journal
The surface acoustic wave (SAW) device on a ball is expected to provide high-performance sensors. Since we must deal with three-dimensional wave fields for precise design of ball SAW devices, numerical methods, such as the finite element method, will require too many elements. Therefore, we applied an analytical solution to a practical calculation of the full-field acoustic waves. For an IDT aperture of 6° and 80° with a wave number parameter of 45, the SAW has a divergent beam and a focusing beam, respectively. For an intermediate aperture of 30°, the SAW forms a collimating beam. This calculation confirmed the possibility of an extremely sensitive sensor with diffraction-free SAWs without disturbance by spurious bulk waves. © 2003 American Institute of Physics.


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