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Hyperuniform disordered phononic structures

G. Gkantzounis, T. Amoah, and M. Florescu
Phys. Rev. B 95, 094120 – Published 31 March 2017
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Abstract

We demonstrate the existence of large phononic band gaps in designed hyperuniform (isotropic) disordered two-dimensional (2D) phononic structures of Pb cylinders in an epoxy matrix. The phononic band gaps in hyperuniform disordered phononic structures are comparable to band gaps of similar periodic structures, for both out-of-plane and in-plane polarizations. A large number of localized modes is identified near the band edges, as well as diffusive transmission throughout the rest of the frequency spectrum. Very high Q cavity modes for both out-of-plane and in-plane polarizations are formed by selectively removing a single cylinder out of the structure. Efficient waveguiding with almost 100% transmission through waveguide structures with arbitrary bends is also presented. We expand our results to thin three-dimensional layers of such structures and demonstrate effective band gaps related to the respective 2D band gaps. Moreover, the drop in the Q factor for the three-dimensional structures is not more than three orders of magnitude compared to the 2D ones.

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  • Received 23 December 2016
  • Revised 1 March 2017

DOI:https://doi.org/10.1103/PhysRevB.95.094120

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsGeneral PhysicsStatistical Physics & ThermodynamicsInterdisciplinary Physics

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Image—Sound Waves Guided Along Curvy Path

Published 31 March 2017

A new image from 3D computer simulations demonstrates that tiny, randomly arranged pillars can allow an acoustic wave to be efficiently guided through an arbitrarily shaped channel.

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Authors & Affiliations

G. Gkantzounis, T. Amoah, and M. Florescu*

  • Department of Physics, Advanced Technology Institute, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom

  • *m.florescu@surrey.ac.uk

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Issue

Vol. 95, Iss. 9 — 1 March 2017

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