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Metamaterials with the transformation method has greatly promoted thedevelopment in achieving invisibility and illusion for various classical waves.However, the requirement of tailor-made bulk materials and extreme constitutiveparameters associated to illusion designs hampers its further progress.Inspired by recent demonstrations of metasurfaces in achieving reduced versionsof electromagnetic cloaks, we propose and experimentally demonstrate sourceillusion devices to manipulate flexural waves using metasurfaces. The approachis particularly useful for elastic waves due to the lack of form-invariance inusual transformation methods. We demonstrate metasurfaces for shifting,transforming and splitting a point source with "space-coiling" structures. Theeffects are found to be broadband and robust against a change of sourceposition, with agreement from numerical simulations and Huygens-Fresnel theory.The proposed approach provides an avenue to generically manipulate guidedelastic waves in solids, and is potentially useful for applications such asnon-destructive testing, enhanced sensing and imaging.

Source illusion devices for flexural Lamb waves using elastic metasurfaces