Manipulation of Electromagnetic and Acoustic Wave Behaviors via Shared Digital Coding Metallic Metasurfaces

Abstract

Introducing certain surface susceptibilities on the interface of boundaries is a well‐known strategy to steer wave behaviors in different physical domains. However, most designs are thus far limited to engineer specific functionalities in a given physical application scenario. Herein, the approach manipulating electromagnetic (EM) and acoustic waves simultaneously on a shared digital coding metallic metasurface is described. The physical mechanism to realize the multiphysics digital coding is the equivalent governing equations behind wave behaviors as well as the boundary conditions with an identical mathematic model. Using split‐ring resonators, 3‐bit multiphysics digital coding elements are created, from which flexible wave‐control devices are realized by simply designing coding sequences. As examples, multiple‐beam generation, scattering reduction, beam steering, and beam forming are numerically demonstrated for both EM and acoustic fields. The anomalous reflection phenomena based on 3‐bit multiphysics coding elements are experimentally performed to validate the design concept. The design strategy provides possibilities to manipulate multiwave behaviors in the shared metasurface, with a wide range of potential applications in the future.