Janus elastic metasurface for flexural wave manipulation

Steering opposed elastic waves independently with a single platform is crucial for multifunctional mechanical devices, but has remained out of reach. This study presents a Janus elastic metasurface that enables independent bidirectional control of broadband flexural waves, supported by a comprehensive theoretical framework and experimental verification. Leveraging high reflection and bianisotropic phase shifts, the design overcomes the one-sided limitation of conventional elastic metasurfaces. This innovative advance opens avenues to multifunctional devices, vibration control, and energy harvesting.