Stopping and reversing sound via dynamic dispersion tuning in a phononic metamaterial
| Autor: | Karki, Pragalv, Paulose, Jayson |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Phys. Rev. Applied 15, 034083 (2021) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevApplied.15.034083 |
| Popis: | 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 acoustic-like 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 metamaterials and electronic heterostructures. Comment: Pre-production and accepted version in Physical Review Applied. The link to the video mentioned in figure 5 of the paper: https://www.youtube.com/watch?v=8dfOst7r4s4&ab_channel=PauloseGroup |
| Databáze: | arXiv |
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