globalchange  > 气候变化与战略
DOI: 10.1073/pnas.2004753117
论文题名:
Nonlocal elastic metasurfaces: Enabling broadband wave control via intentional nonlocality
作者: Zhu H.; Patnaika S.; Walsh T.F.; Jared B.H.; Semperlotti F.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期:42
起始页码: 26099
结束页码: 26108
语种: 英语
英文关键词: Elastic metasurface ; Intentional nonlocality ; Total-internal-reflection ; Wave control ; Wave filtering
Scopus关键词: article ; embedding ; feasibility study ; filtration ; geometry
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.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163378
Appears in Collections:气候变化与战略

Files in This Item:

There are no files associated with this item.


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

Recommended Citation:
Zhu H.,Patnaika S.,Walsh T.F.,et al. Nonlocal elastic metasurfaces: Enabling broadband wave control via intentional nonlocality[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(42)
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Zhu H.]'s Articles
[Patnaika S.]'s Articles
[Walsh T.F.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Zhu H.]'s Articles
[Patnaika S.]'s Articles
[Walsh T.F.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Zhu H.]‘s Articles
[Patnaika S.]‘s Articles
[Walsh T.F.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.