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Crystals 2017, 7(12), 353; doi:10.3390/cryst7120353

Freeform Phononic Waveguides

Department of Physics, Advanced Technology Institute, University of Surrey, Guildford, Surrey GU2 7XH, UK
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Author to whom correspondence should be addressed.
Academic Editors: Abdelkrim Khelif and Sarah Benchabane
Received: 15 October 2017 / Revised: 13 November 2017 / Accepted: 24 November 2017 / Published: 28 November 2017
(This article belongs to the Special Issue Phononics)
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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. View Full-Text
Keywords: phononics; hyperuniform disordered structures; elastic waveguiding; microwave regime phononics; hyperuniform disordered structures; elastic waveguiding; microwave regime
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Gkantzounis, G.; Florescu, M. Freeform Phononic Waveguides. Crystals 2017, 7, 353.

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