首页|Reconfigurable mechanism-based metamaterials for ternary-coded elastic wave polarizers and programmable refraction control
Reconfigurable mechanism-based metamaterials for ternary-coded elastic wave polarizers and programmable refraction control
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Elastic metamaterials with unusual elastic properties offer unprecedented ways to modulate the polarization and propagation of elastic waves.However,most of them rely on the resonant structural components,and thus are frequency-dependent and unchangeable.Here,we present a reconfigurable 2D mechanism-based metamaterial which possesses transformable and frequency-independent elastic properties.Based on the proposed mechanism-based metamaterial,interesting functionalities,such as ternary-coded elastic wave polarizer and programmable refraction,are demonstrated.Particu-larly,unique ternary-coded polarizers,with 1-trit polarization filtering and 2-trit polar-ization separating of longitudinal and transverse waves,are first achieved.Then,the strong anisotropy of the proposed metamaterial is harnessed to realize positive-negative bi-refraction,only-positive refraction,and only-negative refraction.Finally,the wave functions with detailed microstructures are numerically verified.
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