2017/11/11 by Xiaoshi Su, Su, Xiaoshi, Zhaocheng Lu +3 · 2 citations
Physics and Astronomy · #Applied Physics (physics.app-ph) #FOS: Physical sciences #physics.app-ph
paper · pdf · doi:10.48550/arxiv.1711.04193
9 pages, 11 figures
arxiv created 2017/11/11 · arxiv updated 2017/11/15
Although recent advances have made it possible to manipulate electromagnetic and acoustic wavefronts with sub-wavelength metasurface slabs, the design of elastodynamic counterparts remains challenging. We introduce a novel but simple design approach to control SV-waves in elastic solids. The proposed metasurface can be fabricated by cutting an array of aligned parallel cracks in a solid such that the materials between the cracks act as plate-like waveguides in the background medium. The plate array is capable of modulating the phase change of SV-wave while keeping the phase of P-wave unchanged. An analytical model for SV-wave incidence is established to calculate the transmission coefficient and the transmitted phase through the plate-like waveguide explicitly. A complete 2π range of phase delay is achieved by selecting different thicknesses for the plates. An elastic metasurface for splitting SV- and P-waves is designed and demonstrated using full wave finite element (FEM) simulations. Two metasurfaces for focusing plane and cylindrical SV-waves are also presented.