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We experimentally achieve wave mode conversion and rainbow trapping in anelastic waveguide loaded with an array of resonators. Rainbow trapping is aphenomenon that induces wave confinement as a result of a spatial variation ofthe wave velocity, here promoted by gently varying the length of consecutiveresonators. By breaking the geometrical symmetry of the waveguide, we combinethe wave speed reduction with a reflection mechanism that mode-convertsflexural waves impinging on the array into torsional waves travelling alongopposite directions. The framework presented herein may open opportunities inthe context of wave manipulation through the realization of structuralcomponents with concurrent wave conversion and energy trapping capabilities.

Selective mode conversion and rainbow trapping via graded elastic waveguides