Stopping and Reversing Sound via Dynamic Dispersion Tuning in a Phononic Metamaterial

Pragalv Karki and Jayson Paulose
Phys. Rev. Applied 15, 034083 – Published 29 March 2021

Abstract

Slowing down, stopping, and reversing a signal is a core functionality for information processing. Here, we show that this functionality can be realized by tuning the dispersion of a periodic system through a dispersionless, or flat, band. Specifically, we propose a phononic metamaterial based on plate resonators, in which the phonon band dispersion can be modified from an acousticlike to an optical character by modulating a uniform prestress. The switch is enabled by the change in sign of an effective coupling between fundamental modes, which generically leads to a nearly dispersion-free band at the transition point. We demonstrate how adiabatic tuning of the band dispersion can immobilize and reverse the propagation of a sound pulse in simulations of a one-dimensional resonator chain. Our study relies on the basic principles of thin-plate elasticity independently of any specific material, making our results applicable across varied length scales and experimental platforms. More broadly, our approach could be replicated for signal manipulation in photonic metamaterials and electronic heterostructures.

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  • Received 1 October 2020
  • Revised 26 February 2021
  • Accepted 2 March 2021

DOI:https://doi.org/10.1103/PhysRevApplied.15.034083

© 2021 American Physical Society

Physics Subject Headings (PhySH)

Polymers & Soft MatterCondensed Matter, Materials & Applied Physics

Authors & Affiliations

Pragalv Karki1,* and Jayson Paulose1,2,†

  • 1Department of Physics and Institute for Fundamental Science, University of Oregon, Eugene, Oregon 97403, USA
  • 2Material Science Institute, University of Oregon, Eugene, Oregon 97403, USA

  • *pragalvk@uoregon.edu
  • jpaulose@uoregon.edu

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Vol. 15, Iss. 3 — March 2021

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