Bianisotropic Acoustic Metasurface for Surface-Wave-Enhanced Wavefront Transformation

Recent advances in metasurfaces have shown that efficient wavefront transformation can be obtained by carefully designing the bianisotropic response of the metasurfaces. However, as will be shown in this paper, applying such a scheme for complicated wavefront transformations will lead to nonreciprocal local response, which is difficult to realize physically, if the field is not designed properly. In this paper, we identify the local power conservation requirement and introduce surface waves into the scattered field to meet such requirements. Based on such a scheme, we develop a bianisotropic metasurface design approach for near-perfect arbitrary beam splitting and anomalous reflection. Such a passive and reciprocal design approach enables experimental demonstration of surface-wave-enhanced wavefront transformation.

Duke Scholars

Author Steven A. Cummer Electrical and Computer Engineering