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Article Dans Une Revue Journal of Applied Physics Année : 2019

Spatial waveguide mode separation for acoustic waves in a meta-slab composed of subunits with graded thicknesses

Résumé

A meta-slab composed of subunits with graded thicknesses is proposed for spatially separating the zeroth- and first-order acoustic waveguide modes according to the generalized Snell's law. The phase velocity for the first-order mode depends on the waveguide thickness, whereas that for the zeroth-order mode does not. This enables the required phase-shift gradients of the meta-slab to be obtained for spatially separating the two waveguide modes. To design the meta-slab, analytic solutions are derived for the transmission coefficients and phase shifts of the incident acoustic waves with the two modes propagating through the subunits. Numerical simulations with transient finite-element analyses are implemented to demonstrate the propagation of the two waveguide modes. Sinusoidal signal and tone-burst excitations are applied in the analyses. The latter case shows that the two waveguide modes can be successfully separated in space by the designed meta-slab.
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Dates et versions

hal-02374198 , version 1 (21-11-2019)

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Yanlong Xu, Liyun Cao, Pai Peng, B. Assouar, Zhichun Yang. Spatial waveguide mode separation for acoustic waves in a meta-slab composed of subunits with graded thicknesses. Journal of Applied Physics, 2019, 126 (16), pp.165110. ⟨10.1063/1.5098498⟩. ⟨hal-02374198⟩
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