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Qin Z, Qian C, Shen L, Wang X, Kaminer I, Chen H, Wang H. Superscattering of water waves. Natl Sci Rev 2023; 10:nwac255. [PMID: 37266547 PMCID: PMC10232047 DOI: 10.1093/nsr/nwac255] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2022] [Revised: 10/12/2022] [Accepted: 10/24/2022] [Indexed: 07/02/2024] Open
Abstract
Inspired by the concept of superscattering in optics, we for the first time theoretically predict and experimentally demonstrate the superscattering phenomenon in water waves. The subwavelength superscatterer is constructed by multi-layered concentric cylinders with an inhomogeneous depth profile. The superscatterer breaks the long-held single-channel scattering limit by several times and thus significantly enhances the total scattering strength. The underlying mechanism originates from the near degeneracy of the resonances of multiple channels. We fabricate the superscatterer prototype and experimentally measure the near-field patterns, which are consistent with theoretical prediction and numerical simulation. Our study opens a new avenue to strengthen water-wave scattering and deepen the understanding in water waves, which can be useful for ocean energy harvesting and harbor protection.
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Affiliation(s)
- Zijian Qin
- Key Laboratory of Ocean Observation-Imaging Testbed of Zhejiang Province, Institute of Marine Electronics Engineering, Ocean College, Zhejiang University, Hangzhou 310058, China
- ZJU-Hangzhou Global Science and Technology Innovation Center, Key Lab. of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang, Zhejiang University, Hangzhou 310027, China
| | - Chao Qian
- ZJU-UIUC Institute, Interdisciplinary Center for Quantum Information, State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China
- ZJU-Hangzhou Global Science and Technology Innovation Center, Key Lab. of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang, Zhejiang University, Hangzhou 310027, China
- Jinhua Institute of Zhejiang University, Zhejiang University, Jinhua 321099, China
| | - Lian Shen
- ZJU-UIUC Institute, Interdisciplinary Center for Quantum Information, State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China
- ZJU-Hangzhou Global Science and Technology Innovation Center, Key Lab. of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang, Zhejiang University, Hangzhou 310027, China
| | - Xiaoping Wang
- Key Laboratory of Ocean Observation-Imaging Testbed of Zhejiang Province, Institute of Marine Electronics Engineering, Ocean College, Zhejiang University, Hangzhou 310058, China
| | - Ido Kaminer
- Department of Electrical Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel
| | - Hongsheng Chen
- ZJU-UIUC Institute, Interdisciplinary Center for Quantum Information, State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China
- ZJU-Hangzhou Global Science and Technology Innovation Center, Key Lab. of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang, Zhejiang University, Hangzhou 310027, China
- Jinhua Institute of Zhejiang University, Zhejiang University, Jinhua 321099, China
| | - Huaping Wang
- Key Laboratory of Ocean Observation-Imaging Testbed of Zhejiang Province, Institute of Marine Electronics Engineering, Ocean College, Zhejiang University, Hangzhou 310058, China
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Zhao X, Hu X, Zi J. Fast Water Waves in Stationary Surface Disk Arrays. PHYSICAL REVIEW LETTERS 2021; 127:254501. [PMID: 35029421 DOI: 10.1103/physrevlett.127.254501] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Accepted: 11/18/2021] [Indexed: 06/14/2023]
Abstract
Traditionally, the phase and group velocities of water waves can be increased by increasing water depth but possess upper bounds, which are related to the gravitational acceleration and difficult to exceed. Here, we theoretically propose and experimentally demonstrate that when water is covered with a periodic array of stationary rigid disks, both the gravitational acceleration and reduced water depth can be effectively increased in the lowest frequency band. As a result, fast water waves can occur in the system, with both the phase and group velocities exceeding those in water without disks. Unusual effects, such as total reflection at oblique incidence and unidirectional transmission of water waves, are further realized.
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Affiliation(s)
- Xinyu Zhao
- Department of Materials Science and Key Laboratory of Micro- and Nano-Photonic Structures (Ministry of Education), Fudan University, Shanghai 200433, China
| | - Xinhua Hu
- Department of Materials Science and Key Laboratory of Micro- and Nano-Photonic Structures (Ministry of Education), Fudan University, Shanghai 200433, China
- Peng Cheng Lab, Shenzhen 518000, China
| | - Jian Zi
- Department of Physics and Key Laboratory of Surface Physics, Fudan University, Shanghai 200433, China
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3
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Affiliation(s)
- Yu-Hsin Chen
- Institute of Applied Mechanics; National Taiwan University; Taipei 106 Taiwan, R.O.C
| | - Sheng D. Chao
- Institute of Applied Mechanics; National Taiwan University; Taipei 106 Taiwan, R.O.C
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4
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Wang Z, Li C, Zatianina R, Zhang P, Zhang Y. Carpet cloak for water waves. Phys Rev E 2017; 96:053107. [PMID: 29347642 DOI: 10.1103/physreve.96.053107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2016] [Indexed: 06/07/2023]
Abstract
Cloaking is a challenging topic in the field of wave motion, and is of significant theoretical value. In this article, a type of carpet cloak has been theoretically designed for water waves by using the effective medium and transformation theory. This carpet cloak device, created by a three-dimensional printer, is composed of a periodic structure which realizes the equivalent anisotropic water depth. We demonstrate its excellent cloaking performance numerically and experimentally in a wide range of frequencies and angles of incidence, with low wave attenuation characteristics and simple device realization of this carpet cloak illustrating that water wave transformation is a powerful method with which to manipulate water waves.
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Affiliation(s)
- Zhenyu Wang
- College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, People's Republic of China
| | - Chunyang Li
- College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, People's Republic of China
| | - Razafizana Zatianina
- College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, People's Republic of China
| | - Pei Zhang
- College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, People's Republic of China
| | - Yongqiang Zhang
- College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, People's Republic of China
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Manipulating Water Wave Propagation via Gradient Index Media. Sci Rep 2015; 5:16846. [PMID: 26603312 PMCID: PMC4658485 DOI: 10.1038/srep16846] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2015] [Accepted: 10/14/2015] [Indexed: 11/08/2022] Open
Abstract
It is challenging to realise the perfect manipulation of water waves within a broad
range of frequencies. By extending conformal transformation principles to water
waves, their propagation can be controlled via gradually varying water depths,
permitting the realisation of a desired refractive index profile for linear water
surface waves. Wave bending, directional wave emission and wave focusing are
analysed experimentally with accompanying simulations. The results demonstrate
desired wave manipulations within a broad range of frequencies, confirming the
accuracy and effectiveness of conformal transformation for water waves.
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Zhang C, Chan CT, Hu X. Broadband focusing and collimation of water waves by zero refractive index. Sci Rep 2014; 4:6979. [PMID: 25381845 PMCID: PMC4225562 DOI: 10.1038/srep06979] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2014] [Accepted: 10/21/2014] [Indexed: 11/09/2022] Open
Abstract
It is always a challenge to realize extreme and unusual values of refractive index for a broad range of frequencies. We show that when water is covered by a thick, rigid and unmovable plate, it behaves like a medium with zero refractive index for water waves at any frequency. Hence, by covering water with a plate of a concave or rectangular shape, water waves can be focused or collimated in a broad range of frequencies. Experiments were conducted to demonstrate these effects and results are in excellent agreement with numerical simulations.
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Affiliation(s)
- Chi Zhang
- Department of Materials Science, Laboratory of Advanced Materials and Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Fudan University, Shanghai 200433, China
| | - C T Chan
- Department of Physics and Institute for Advanced Study, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China
| | - Xinhua Hu
- Department of Materials Science, Laboratory of Advanced Materials and Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Fudan University, Shanghai 200433, China
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Berraquero CP, Maurel A, Petitjeans P, Pagneux V. Experimental realization of a water-wave metamaterial shifter. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2013; 88:051002. [PMID: 24329207 DOI: 10.1103/physreve.88.051002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2012] [Revised: 05/21/2013] [Indexed: 06/03/2023]
Abstract
We demonstrate by quantitative experimental measurements that metamaterials with anisotropic properties can be used in the context of water waves to produce a reflectionless bent waveguide. The anisotropic medium consists in a bathymetry with subwavelength layered structure that shifts the wave in the direction of the waveguide bending (10°, 20°, and 30°). The waveguide filled with such metamaterial is tested experimentally and compared to a reference empty bent waveguide. The experimental method used to characterize the wave field allows for space-time resolved measurements of water elevation. Results show the efficiency of the shifter. Modal treatment of the experimental data confirms that the metamaterial prevents higher modes from being excited in the waveguide.
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Affiliation(s)
- C P Berraquero
- Blackett Laboratory, Imperial College London, London SW7 2AZ, United Kingdom
| | - A Maurel
- Institut Langevin LOA, UMR CNRS 7587-ESPCI, 5 rue Jussieu, 75005 Paris, France
| | - P Petitjeans
- Laboratoire de Physique et Mécanique des Milieux Hétérogènes (PMMH), UMR CNRS 7636-ESPCI-UPMC Univ. Paris 6-UPD Univ. Paris 7, 10 rue Vauquelin, 75005 Paris, France
| | - V Pagneux
- Laboratoire d'Acoustique de l'Université du Maine, UMR CNRS 6613, Avenue Olivier Messiaen, 72085 Le Mans, France
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