论文标题
通过动态分散调谐在声音超材料中停止和逆转声音
Stopping and reversing sound via dynamic dispersion tuning in a phononic metamaterial
论文作者
论文摘要
放慢，停止和逆转信号是信息处理的核心功能。在这里，我们表明，可以通过通过无散或平坦的频带调整周期系统的分散来实现此功能。具体而言，我们提出了基于板谐振器的语音超材料，其中可以通过调节均匀的播放物来从声学样本中修改声子色带分散体。通过基本模式之间有效耦合的迹象的变化可以实现该开关，这通常导致过渡点处的几乎无散的频段。我们证明了频带分散的绝热调整如何在一维谐振链的模拟中固定并逆转声音的传播。我们的研究依靠薄板弹性的基本原理独立于任何特定材料，这使得我们的结果适用于各种长度尺度和实验平台。更广泛地说，我们的方法可能是超材料和电子异质结构。
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.
