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Freeform Phononic Waveguides

Gkantzounis, Georgios and Florescu, Marian (2017) Freeform Phononic Waveguides Crystals, 7 (12).

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Abstract

We employ a recently introduced class of artificial structurally-disordered phononic structures that exhibit large and robust elastic frequency band gaps for efficient phonon guiding. Phononic crystals are periodic structures that prohibit the propagation of elastic waves through destructive interference and exhibit large band gaps and ballistic propagation of elastic waves in the permitted frequency ranges. In contrast, random-structured materials do not exhibit band gaps and favour localization or diffusive propagation. Here, we use structures with correlated disorder constructed from the so-called stealthy hyperuniform disordered point patterns, which can smoothly vary from completely random to periodic (full order) by adjusting a single parameter. Such amorphous-like structures exhibit large band gaps (comparable to the periodic ones), both ballistic-like and diffusive propagation of elastic waves, and a large number of localized modes near the band edges. The presence of large elastic band gaps allows the creation of waveguides in hyperuniform materials, and we analyse various waveguide architectures displaying nearly 100% transmission in the GHz regime. Such phononic-circuit architectures are expected to have a direct impact on integrated micro-electro-mechanical filters and modulators for wireless communications and acousto-optical sensing applications.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Gkantzounis, Georgiosg.gkantzounis@surrey.ac.uk
Florescu, Marianm.florescu@surrey.ac.uk
Date : 28 November 2017
Funders : Engineering and Physical Sciences Research Council (EPSRC)
Identification Number : 10.3390/cryst7120353
Copyright Disclaimer : © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Uncontrolled Keywords : Phononics; Hyperuniform disordered structures; Elastic waveguiding; Microwave regime
Additional Information : The data underlying the findings of this study are available without restriction. Details of the data and how to request access are available from the University of Surrey publications repository: http://doi.org/10.15126/surreydata.00845033.
Depositing User : Clive Harris
Date Deposited : 04 Dec 2017 14:31
Last Modified : 19 Jun 2018 06:14
URI: http://epubs.surrey.ac.uk/id/eprint/845097

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