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Gradient folding metasurfaces with simultaneous phase and amplitude modulation
Zibin Lin,Weikai Xu,Wei Wang,Shasha Yuan 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.12
An elastic metasurface with a gradient index of functional units, namely gradient folding metasurface (GFMS), is proposed to simultaneously manipulate the transmission phase and amplitude of flexural waves. By varying the gradient index common ratio (CR) between each adjacent unit, the GFMS was found to cover an entire 2π span of phase shift. At the same time, the amplitude of the transmitted flexural wave can also be modulated. Based on the generalized Snell's law, two different cases of the wave focusing effect are realized, which illustrate CR dependent wave propagation mode from symmetric to asymmetric and verify the ability of the proposed metasurface to manipulate complete elastic wave through simultaneous phase and amplitude modulation. This study expands phase-amplitude modulation from acoustics to elastic waves and provides more degrees of freedom in elastic metasurface designing.