胡新华教授课题组研究成果发表在Scientific Report上
发布时间:2015-05-11        浏览次数:52

Experimental Observation of Negative Effective Gravity in Water Waves


Author(s): Hu, XH (Hu, Xinhua)[ 1,2 ] ; Yang, J (Yang, Jiong)[ 1,2,3,4 ] ; Zi, J (Zi, Jian)[ 3,4 ] ; Chan, CT (Chan, C. T.)[ 5 ] ; Ho, KM (Ho, Kai-Ming)[ 6,7 ]

Source: SCIENTIFIC REPORTS  Volume: 3     Article Number: 1916   DOI: 10.1038/srep01916  

Published: MAY 29 2013

Times Cited: 0 (from Web of Science)
Cited References: 42      [ view related records ]     Citation Map     

Abstract: The gravity of Earth is responsible for the formation of water waves and usually difficult to change. Although negative effective gravity was recently predicted theoretically in water waves, it has not yet been observed in experiments and remains a mathematical curiosity which is difficult to understand. Here we experimentally demonstrate that close to the resonant frequency of purposely-designed resonating units, negative effective gravity can occur for water waves passing through an array of resonators composing of bottom-mounted split tubes, resulting in the prohibition of water wave propagation. It is found that when negative gravity occurs, the averaged displacement of water surface in a unit cell of the array has a phase difference of pi to that along the boundary of the unit cell, consistent with theoretical predictions. Our results provide a mechanism to block water waves and may find applications in wave energy conversion and coastal protection.

Accession Number: WOS:000319553800003

Document Type: Article

Language: English

KeyWords Plus: REFRACTIVE-INDEX; METAMATERIALS; PROPAGATION; ARRAY; POWER

Reprint Address: Hu, XH (reprint author)

Fudan Univ, Dept Mat Sci, Key Lab Micro & Nanophoton Struct, Minist Educ, Shanghai 200433, Peoples R China.

Addresses:

[ 1 ] Fudan Univ, Dept Mat Sci, Key Lab Micro & Nanophoton Struct, Minist Educ, Shanghai 200433, Peoples R China

[ 2 ] Fudan Univ, Adv Mat Lab, Shanghai 200433, Peoples R China

[ 3 ] Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China

[ 4 ] Fudan Univ, Key Lab Surface Phys, Shanghai 200433, Peoples R China

[ 5 ] Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Hong Kong, Peoples R China

[ 6 ] Iowa State Univ, Ames Lab, Ames, IA 50011 USA

[ 7 ] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

E-mail Addresses: huxh@fudan.edu.cn; jzi@fudan.edu.cn