论文标题
通过振幅偏移弹性元时间的转向弯曲波
Steering Flexural Waves by Amplitude-Shift Elastic Metasurfaces
论文作者
论文摘要
作为具有亚波长度结构的2D材料，弹性元面积通过人工边界条件显示出显着的弹性波。但是，当前元信息的应用前景可能受其仅相位调节边界的限制。本文中，我们通过添加振幅转移调制来介绍下一代的弹性元信息。通过修改huygens-fresnel原理，提出了由元时间引导的目标波场的一般理论。作为示例，进行了两个有关薄板中弯曲波的振幅偏移跨度：一种是通过阐述振幅和相移，将圆柱波转换为高斯光束，而另一个是仅通过振幅调节来对其进行聚焦。这些示例在理论计算，数值模拟和实验测试中很好地重合。这项工作可能是对指导弹性波的完全控制的元时间设计的基础，并且可以扩展到更复杂的应用，例如模拟信号处理和全息成像。
As 2D materials with subwavelength structures, elastic metasurfaces show remarkable abilities to manipulate elastic waves at will through artificial boundary conditions. However, the application prospects of current metasurfaces may be restricted by their phase-only modulating boundaries. Herein, we present the next generation of elastic metasurfaces by additionally incorporating amplitude-shift modulation. A general theory for target wave fields steered by metasurfaces is proposed by modifying the Huygens-Fresnel principle. As examples, two amplitude-shift metasurfaces concerning flexural waves in thin plates are carried out: one is to transform a cylindrical wave into a Gaussian beam by elaborating both amplitude and phase shifts, and the other one is to focus the incidence by amplitude modulations only. These examples coincide well over theoretical calculations, numerical simulations and experimental tests. This work may underlie the design of metasurfaces with complete control over guided elastic waves, and may extend to more sophisticated applications, such as analog signal processing and holographic imaging.
