Graded-Index Metamaterial Waveguides: An Innovative Approach to Acoustic Wave Control

渐变折射率超材料波导：声波控制的创新方法

• 批准号: 1436347
• 负责人: Miao Yu
• 金额: $ 33万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-08-01 至 2018-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1436347&HistoricalAwards=false
• 关键词: Graded; Index; Metamaterial; Waveguides; Innovative

Acoustic waves play an important role in many applications, such as homeland security (e.g. sonar systems), healthcare (e.g. ultrasound imaging), and industry (e.g., non-destructive damage detections). However, there are currently limited functional acoustic materials that can effectively control and manipulate acoustic waves and be employed for next-generation acoustic-based devices. This award supports fundamental research on guiding, compression, amplification, and localization of acoustic waves through novel artificial acoustic materials (i.e., acoustic metamaterials). These engineered materials possess unique properties that are unachievable in natural materials. This work will open up new avenues towards the development of novel functional acoustic devices, which can potentially overcome the fundamental limitations encountered in conventional acoustic technologies. Various disciplines including physics, material science, medicine, measurement science, and energy sciences will benefit from different facets of this research. This award will also help broaden the participation of underrepresented groups in research and enrich the learning experience of students with innovative projects in an interdisciplinary curriculum integrated with the research findings.Through combined analytical, numerical, and experimental studies, the goal of this work is to achieve a fundamental understanding of the acoustic wave propagation and guiding mechanisms, material dispersion, effective refractive indices in various graded-index metamaterial waveguides. The largely unexplored properties of these acoustic metamaterials, including the remarkable wave compression and field amplification properties, will be investigated. This research will enrich the knowledge in the growing field of anisotropic metamaterials and lead to new methodologies for control and manipulation of acoustic fields with metamaterials. Furthermore, a novel experimental approach based on a fiber optic acoustic scanning system with graphene based fiber optic probes will be developed, which will offer an entirely new way for mapping and visualization of wave propagation properties in acoustic metamaterials. In addition, this award can also lead to the discovery of fundamentally new physical phenomena in graded-index metamaterial waveguides arrays (bulk graded index metamaterials) in terms of energy coupling, scattering, and localization.

声波在许多应用中发挥重要作用，例如国土安全（例如声纳系统）、医疗保健（例如超声成像）和工业（例如，非破坏性损伤检测）。然而，目前存在有限的功能声学材料，可以有效地控制和操纵声波，并用于下一代基于声学的设备。该奖项支持通过新型人造声学材料（即，声学超材料）。这些工程材料具有天然材料无法实现的独特性能。这项工作将为开发新型功能声学设备开辟新的途径，这些设备可以克服传统声学技术中遇到的基本限制。包括物理学，材料科学，医学，测量科学和能源科学在内的各个学科将从这项研究的不同方面受益。该奖项还将有助于扩大代表性不足的群体在研究中的参与，并通过与研究成果相结合的跨学科课程中的创新项目丰富学生的学习经验。通过结合分析，数值和实验研究，这项工作的目标是实现对声波传播和引导机制，材料色散，各种渐变折射率超材料波导中的有效折射率。这些声学超材料，包括显着的波压缩和场放大性能，在很大程度上未开发的属性，将进行调查。本研究将丰富各向异性超材料领域的知识，并为超材料声场的控制和操纵提供新的方法。此外，一种新的实验方法的基础上，光纤声学扫描系统与石墨烯基光纤探头将开发，这将提供一个全新的方式映射和可视化的波传播特性的声学超材料。此外，该奖项还可以在能量耦合，散射和局部化方面发现梯度折射率超材料波导阵列（散装梯度折射率超材料）中的全新物理现象。