Fluid-like elastic metasurface

Author:

Shin Ye Jeong1ORCID,Seung Hong Min23ORCID,Oh Joo Hwan1ORCID

Affiliation:

1. Department of Mechanical Engineering, Ulsan National Institute of Science and Technology, UNIST-gil 50 1 , Eonyang-eup, Ulju-gun, Ulsan 44919, South Korea

2. Intelligent Wave Engineering Team, Korea Research Institute of Standards and Science 2 , Daejeon 34113, South Korea

3. Department of Precision Measurement, University of Science and Technology (UST) 3 , Daejeon 34113, South Korea

Abstract

What makes elastic waves different from other waves is the existence of various wave modes and coupling between these modes. Accordingly, the manipulation of elastic waves suffers from many limitations due to mode coupling, which is an inherent complex physical property of elastic waves. In this study, we propose fluid-like elastic metasurfaces that act as an acoustic (fluid) surface to perfectly eliminate mode coupling. Because longitudinal and shear waves are decoupled, only reflected longitudinal (or shear) waves exist when longitudinal (or shear) waves are incident. Using a strip-type unit cell, elastic metasurfaces mimicking acoustic hard-wall and soft-wall were designed and realized. In addition, numerical analysis and experiments were conducted to prove the validity of the designed unit cells. This study presents a more versatile metasurface by solving the mode coupling of solid elastic waves. In addition, two types of designed fluid-like metasurfaces are expected to be utilized in further studies considering the opposite phase shift characteristic.

Funder

National Research Foundation of Korea

Korea Environment Industry and Technology

Korea Research Institute of Standard and Science

Publisher

AIP Publishing

Subject

Physics and Astronomy (miscellaneous)

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