Broadband Asymmetric Propagation in Pillared Meta-Plates

The asymmetric propagation of mechanical energy across interfaces is a challenging problem with a wide range of applications. In this work, we present a novel structure presenting the asymmetric propagation of elastic waves in thin plates in a broadband range. The structure consists of a combination...

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Bibliographic Details
Main Authors: Lin Chen, Wei Wang, Guohua Nie, Yabin Jin, Daniel Torrent, Bahram Djafari-Rouhani
Format: Article
Language:English
Published: MDPI AG 2020-08-01
Series:Crystals
Subjects:
Online Access:https://www.mdpi.com/2073-4352/10/8/702
Description
Summary:The asymmetric propagation of mechanical energy across interfaces is a challenging problem with a wide range of applications. In this work, we present a novel structure presenting the asymmetric propagation of elastic waves in thin plates in a broadband range. The structure consists of a combination of symmetrically and asymmetrically distributed pillars, so that the former decouple the different Lamb modes and the latter mix all of them. We show that a combination in tandem with these two structures can realize an efficient broadband asymmetric propagation at the subwavelength range and achieve a transmission difference larger than 200 dB between forward and backward directions. The proposed pillared meta-plate brings a new way for subwavelength and broadband wave manipulation in the fields of wave isolation, sensing and communication, among others.
ISSN:2073-4352