Propagation properties of elastic waves in semi-infinite phononic
crystals and related waveguides |
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| Authors: | Y W Yao F G Wu Z L Hou Y Y Liu |
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| Institution: | (1) Department of Physics, South China University of Technology, Guangzhou, 510640, P.R. China;(2) Department of Applied Physics, Guangdong University of Technology, Guangzhou, 510090, P.R. China;(3) Experiment Center and Department of Applied Physics, Guangdong University of Technology, Guangzhou, 510090, P.R. China |
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| Abstract: | The transmission and reflection coefficients of two-dimensional semi-infinite solid-solid phononic crystal systems and fluid-fluid
phononic waveguide structures have been investigated. The numerical results show that the transmission spectra for longitudinally
and transversally polarized incident waves are different, and the spectra of the transmission and reflection coefficients
of the semi-infinite system agree well with the band structure. The numerical results show that when a guided wave incident,
localized modes are excited, and different polarities have different coupling efficiencies with the incident guided wave.
At the same time, far from the cutoff frequency, the guided wave couples out of semi-infinite waveguide highly efficiently. |
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| Keywords: | 43 20 +g General linear acoustics 43 40 +s Structural acoustics and vibration 46 40 cd Mechanical wave propagation (including diffraction scattering and dispersion) |
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