气候变化领域集成服务门户(CCPortal): Nonlocal elastic metasurfaces: Enabling broadband wave control via intentional nonlocality

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DOI	10.1073/pnas.2004753117
	Nonlocal elastic metasurfaces: Enabling broadband wave control via intentional nonlocality
	Zhu H.; Patnaika S.; Walsh T.F.; Jared B.H.; Semperlotti F.
发表日期	2020
ISSN	0027-8424
起始页码	26099
结束页码	26108
卷号	117 期号:42
英文摘要	While elastic metasurfaces offer a remarkable and very effective approach to the subwavelength control of stress waves, their use in practical applications is severely hindered by intrinsically narrow band performance. In applications to electromagnetic and photonic metamaterials, some success in extending the operating dynamic range was obtained by using nonlocality. However, while electronic properties in natural materials can show significant nonlocal effects, even at the macroscales, in mechanics, nonlocality is a higher-order effect that becomes appreciable only at the microscales. This study introduces the concept of intentional nonlocality as a fundamental mechanism to design passive elastic metasurfaces capable of an exceptionally broadband operating range. The nonlocal behavior is achieved by exploiting nonlocal forces, conceptually akin to long-range interactions in nonlocal material microstructures, between subsets of resonant unit cells forming the metasurface. These long-range forces are obtained via carefully crafted flexible elements, whose specific geometry and local dynamics are designed to create remarkably complex transfer functions between multiple units. The resulting nonlocal coupling forces enable achieving phase-gradient profiles that are functions of the wavenumber of the incident wave. The identification of relevant design parameters and the assessment of their impact on performance are explored via a combination of semianalytical and numerical models. The nonlocal metasurface concept is tested, both numerically and experimentally, by embedding a total-internal-reflection design in a thin-plate waveguide. Results confirm the feasibility of the intentionally nonlocal design concept and its ability to achieve a fully passive and broadband wave control. © 2020 National Academy of Sciences. All rights reserved.
英文关键词	Elastic metasurface; Intentional nonlocality; Total-internal-reflection; Wave control; Wave filtering
语种	英语
scopus关键词	article; embedding; feasibility study; filtration; geometry
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160208
作者单位	Zhu, H., Ray W. Herrick Laboratories, School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, United States; Patnaika, S., Ray W. Herrick Laboratories, School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, United States; Walsh, T.F., Simulation Modeling Sciences, Sandia National Laboratories, Albuquerque, NM 87185, United States; Jared, B.H., Material, Physical and Chemical Sciences Center, Sandia National Laboratories, Albuquerque, NM 87185, United States; Semperlotti, F., Ray W. Herrick Laboratories, School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, United States
推荐引用方式 GB/T 7714	Zhu H.,Patnaika S.,Walsh T.F.,et al. Nonlocal elastic metasurfaces: Enabling broadband wave control via intentional nonlocality[J],2020,117(42).
APA	Zhu H.,Patnaika S.,Walsh T.F.,Jared B.H.,&Semperlotti F..(2020).Nonlocal elastic metasurfaces: Enabling broadband wave control via intentional nonlocality.Proceedings of the National Academy of Sciences of the United States of America,117(42).
MLA	Zhu H.,et al."Nonlocal elastic metasurfaces: Enabling broadband wave control via intentional nonlocality".Proceedings of the National Academy of Sciences of the United States of America 117.42(2020).