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Broadband Asymmetric Propagation in Pillared Meta-Plates

Abstract : 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.
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Submitted on : Thursday, September 17, 2020 - 2:59:30 PM
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Lin Chen, Wei Wang​, Guohua Nie, Yabin Jin, Daniel Torrent, et al.. Broadband Asymmetric Propagation in Pillared Meta-Plates. Crystals, MDPI, 2020, 10 (8), pp.702. ⟨10.3390/cryst10080702⟩. ⟨hal-02941995⟩

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