EFRI NewLAW: Topological acoustic metamaterials for programmable and high-efficiency one-way transport

EFRI NewLAW：用于可编程和高效单向传输的拓扑声学超材料

基本信息

批准号：
1741618
负责人：
Xiaoming Mao
金额：
$ 200万
依托单位：
Regents of the University of Michigan - Ann Arbor
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-09-01 至 2023-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1741618&HistoricalAwards=false
关键词：
EFRI NewLAW Topological acoustic metamaterials

项目摘要

In this research, physicists, wave mechanicians and materials scientists will come together to design, fabricate and characterize novel metamaterials with nonreciprocal wave propagation attributes. The field of sound waves, which represent the oldest way of communication between human beings, is experiencing a revival in the context of modern material technology and engineering, with a myriad of applications ranging from medical imaging and echolocation to acoustic cloaking. A fundamental principle governing wave propagation in both fluid and solid media, called "reciprocity", is that the transmission rate of waves must be equal forward and backward between any two arbitrarily selected points in a medium. The ability to break this principle, that is, the realization of one-directional mechanical or acoustic "diodes" will enable the design of new classes of mechanical systems with novel functionalities, including adaptive sensors and vibration isolation devices. It will also provide a transformative contribution to the emerging field of material logic, a design paradigm where simple structural and material modules are used as the engineering building blocks to create mechanical devices of arbitrary complexity. The core conceptual ideas behind the research originate from the notion of "topological protection", which is exploited to obtain wave propagation properties that are robust against disorder and noise. The knowledge developed through this research will advance technologies, including but not limited to: a) mechanical computing, where acoustic logic ports can be seen as building blocks capable of carrying out an array of mathematical operations, and b) devices with novel thermal transport properties, exploiting the analogy between thermal phonons and mechanical vibrations at the spatial and temporal scales of mechanical devices. The research will also be disseminated to the broader community through a workshop with public tutorials, broaden the participation of underrepresented groups in STEM fields through enhancing existing programs at the different academic institutions and will result in YouTube videos to share the discoveries with the general public.This project will develop a fundamental understanding of how the phonon band topology governs the acoustic properties of systems experiencing spatial-temporal modulation, leading to a formal interpretation framework for this type of time-reversal symmetry breaking phenomena. The powerful toolkits to be developed through the project will allow for a rich variety of designs beyond the current boundaries of the use of topological states in acoustic wave control strategies. The research will span frontiers of condensed matter physics, wave mechanics, and materials science. The two main conceptual ideas to be used for the realization of topologically protected nonreciprocal wave propagation are: (1) program the phonon band structure in spatial-temporal modulated materials using principles of topological band theory, and (2) exploit the contrasting wave propagation properties of Maxwell lattices in their metal-like and topological insulator-like phases. The research team will advance the theoretical understanding of the intimate role played by topological protection in nonreciprocal wave propagation, use state-of-the-art fabrication techniques to realize prototypes of acoustic diodes at different scales using a variety of material platforms, and deploy laser-enabled wave reconstruction capabilities to characterize the nonreciprocal wave propagation phenomena in the fabricated metamaterial specimen. By developing and applying principles of topology and material logic design across the scales, the project will transform a set of simple mechanical components into a versatile platform for the next generation acoustic logic ports with programmable acoustic transport and time reversal symmetry breaking capabilities.

在这项研究中，物理学家，波浪级别的人和材料科学家将汇聚在一起设计，捏造和表征具有非注册波浪传播属性的新型超材料。声波领域代表了人类之间最古老的交流方式，它在现代材料技术和工程的背景下正在复兴，从医学成像和回声分配到声学上的掩饰，都有无数的应用。流体和固体培养基中的基本原理（称为“互惠”）的基本原理是，波的传输速率必须在任何两个任意选择的点之间在培养基中的任何两个任意选择点之间相等。破坏这一原理的能力，即实现一方向机械或声学的“二极管”的能力将使具有新功能的新机械系统设计，包括自适应传感器和振动隔离设备。它还将为材料逻辑的新兴领域提供变革性的贡献，该设计范式是一种设计范式，简单的结构和材料模块用作工程构建块，以创建具有任意复杂性的机械设备。该研究背后的核心概念思想源于“拓扑保护”的概念，该概念被利用以获得可抵抗混乱和噪音的稳定性的波传播特性。通过这项研究获得的知识将推进技术，包括但不限于：a）机械计算，在该技术中，声学逻辑端口可以看作是能够执行一系列数学操作的构件，以及b）具有新型热传输属性的设备，利用了在空间和临时尺度的机械范围内的热声音和机械振动之间的类比，机械尺度和机械尺度的机械范围。 The research will also be disseminated to the broader community through a workshop with public tutorials, broaden the participation of underrepresented groups in STEM fields through enhancing existing programs at the different academic institutions and will result in YouTube videos to share the discoveries with the general public.This project will develop a fundamental understanding of how the phonon band topology governs the acoustic properties of systems experiencing spatial-temporal modulation, leading to a formal这种类型的时间反转对称破坏现象的解释框架。通过该项目开发的强大工具包将允许在声波控制策略中使用拓扑状态的当前界限以外的各种设计。该研究将跨越凝结物理，波浪力学和材料科学的前沿。用于实现拓扑保护的非转录波传播的两个主要概念思想是：（1）使用拓扑结构理论的原理在时空调制材料中对声子结构进行编程，并且（2）利用麦克斯韦晶格的对比度传播特性在其金属型和拓扑媒介中，并构成对比度的波浪传播特性。研究团队将提高对拓扑保护在非偏射波传播中扮演的亲密作用的理论理解，使用最先进的制造技术，使用各种材料平台在不同尺度上实现声学二极管的原型，并使用各种启用激光启用激光的波浪重建能力来构造非列表的启动式启动，以进行启动范围。通过在整个尺度上开发和应用拓扑和材料逻辑设计的原理，该项目将将一组简单的机械组件转换为具有可编程的声学传输和时间反向对称性破坏功能的下一代声学逻辑端口的多功能平台。