兰姆波
平面的
波前
光学
调制(音乐)
声学
振动
压电
电容
折射
物理
相位调制
材料科学
波传播
计算机科学
电极
相位噪声
计算机图形学(图像)
量子力学
作者
Shilong Li,Jiawen Xu,Jiong Tang
摘要
This letter reports designs of adaptive metasurfaces capable of modulating incoming wave fronts of elastic waves through electromechanical-tuning of their cells. The proposed elastic metasurfaces are composed of arrayed piezoelectric units with individually connected negative capacitance elements that are online tunable. By adjusting the negative capacitances properly, accurately formed, discontinuous phase profiles along the elastic metasurfaces can be achieved. Subsequently, anomalous refraction with various angles can be realized on the transmitted lowest asymmetric mode Lamb wave. Moreover, designs to facilitate planar focal lenses and source illusion devices can also be accomplished. The proposed flexible and versatile strategy to manipulate elastic waves has potential applications ranging from structural fault detection to vibration/noise control.
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