Experimental Realization of Full Control of Reflected Waves with Subwavelength Acoustic Metasurfaces

Control of sound waves has been inspired by recent advances in using tailored metamaterials to manipulate light. In this study an acoustic metasurface is analytically designed and experimentally realized, with the potential to mold reflected wavefronts into desired forms--even directing nondiffracting beams along complex and nonparaxial trajectories. This level of control may open new avenues for ultrasound imaging, surgical ablation, and other applications.