Non-uniqueness of time-domain reflection from 3D planar elastic layers

► Wave reflection from fiber-reinforced elastic layers is shown to be non-unique. ► Transformation optics is applied to elastodynamic waves in the time domain. ► The approach works in a broadband range and uses passive metamaterials. ► The mass density is scalar, and the elasticity tensor is supersymmetric. ► Layers which trap a considerable part of incident shear wave energy are described.