Analysis and design of elastic metasurfaces with wave manipulation effect

• Main Authors: Meng-HsuehLu, 呂孟學
• Other Authors: Tungyang Chen
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/76849j

碩士 === 國立成功大學 === 土木工程學系 === 107 === The concept of metasurfaces has renewed Snell’s law and opened new directions to manipulate wave due to its novel wavefront shaping functionalities. In order to design elastic metasurfaces that are able to control wave propagation, the physical phenomena of wave transmission in different media and the concept of metasurfaces are discussed. We propose two simple designs of acoustic and elastic metasurfaces based on generalized Snell’s law. The metasurfaces are designed with periodically repeated supercells, in which the frequency dependent properties of the subunit are used to control a phase gradient along the interface. Numerical simulation shows their ability to manipulate wave. We also investigate the effects of some parameters. Our research not only discusses the concept of metasurfaces in detail, but also demonstrates the feasibility of controlling acoustic wave and elastic body waves by metasurfaces.