Frequency modulation of waveguides in acoustic band-gap materials consisting of solid cylinders in viscous liquid |
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| Authors: | Xin Zhang Fugen Wu |
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| Institution: | a Department of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China
b Department of Experiment Education, Guangdong University of Technology, Guangzhou 510006, China |
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| Abstract: | We investigated waveguides in acoustic band-gap materials consisting of steel cylinders in a liquid with viscous damping. Numerical results show that when the viscous penetration depth is comparable to the structural length scale, linear defect states fall in complete acoustic band gaps forming waveguides. It is also found that the magnitude of the viscosity in the liquid has an influence on the frequency of waveguides, that large viscous damping can make the defect modes ascend. An expected frequency of waveguides can be obtained by modulating the viscous damping parameter θ. |
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| Keywords: | Acoustic band-gap materials Linear defect Viscous liquid |
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