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Harnessing Multiple Internal Reflections to Design Highly Absorptive Acoustic Metasurfaces
Physical Review Applied
The rapid development of metasurfaces has enabled numerous intriguing applications with acoustically thin sheets. Here we report the theory and experimental realization of a non-resonant sound absorbing strategy using metasurfaces by harnessing multiple internal reflection. We theoretically and numerically show that the higher order diffraction of thin gradient-index metasurfaces is tied to multiple internal reflection inside the unit cells. Highly absorbing acoustic metasurfaces can bedoi:10.1103/physrevapplied.9.054009 fatcat:c7daiz3kcjcy3fvykiffmcnexu