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The multi-physics metawedge: graded arrays on fluid-loaded elastic plates and the mechanical analogues of rainbow trapping and mode conversion

Title: The multi-physics metawedge: graded arrays on fluid-loaded elastic plates and the mechanical analogues of rainbow trapping and mode conversion
Authors: Skelton, E
Craster, RV
Colombi, A
Colquitt, D
Item Type: Journal Article
Abstract: We consider the propagation and mode conversion of flexural-acoustic waves along a fluid-loaded graded array of elastic resonators, forming a metasurface. The multi-physics nature of the problem, coupling two disparate physical systems, brings both challenges and novel features not previously seen in so-called bifunctional metamaterials. In particular, by using an appropriately designed graded array of resonators, we show that it is possible to employ our metasurface to mode-convert sub-sonic surface flexural waves into bulk acoustic waves and vice-versa; transferring energy between two very different physical systems. Whilst the sub-sonic mechanical surface wave is dispersive, the bulk acoustic wave is dispersionless and radiates energy at infinity. We also show that this bifunctional metasurface is capable of exhibiting the classical effect of rainbow trapping for sub-sonic surface waves.
Issue Date: 4-May-2018
Date of Acceptance: 17-Apr-2018
URI: http://hdl.handle.net/10044/1/59240
DOI: https://dx.doi.org/10.1088/1367-2630/aabecf
ISSN: 1367-2630
Publisher: Institute of Physics (IoP) and Deutsche Physikalische Gesellschaft
Journal / Book Title: New Journal of Physics
Volume: 20
Copyright Statement: © 2018 The Author(s). Published by IOP Publishing Ltd on behalf of Deutsche Physikalische Gesellschaft. Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Commission of the European Communities
The Leverhulme Trust
Funder's Grant Number: EP/L024926/1
653285
RF-2017-017/9
Keywords: 02 Physical Sciences
Fluids & Plasmas
Publication Status: Published
Open Access location: https://doi.org/10.1088/1367-2630/aabecf
Article Number: 053017
Online Publication Date: 2018-04-17
Appears in Collections:Mathematics
Applied Mathematics and Mathematical Physics



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