Remote Water-to-Air Eavesdropping with a Phase-Engineered Impedance Matching Metasurface

被引:16
|
作者
Liu, Jingjing [1 ]
Li, Zhengwei [1 ]
Liang, Bin [1 ]
Cheng, Jian-Chun [1 ]
Alu, Andrea [2 ,3 ]
机构
[1] Nanjing Univ, Inst Acoust, Collaborat Innovat Ctr Adv Microstruct, Dept Phys,Key Lab Modern Acoust,MOE, Nanjing 210093, Peoples R China
[2] City Univ New York, Adv Sci Res Ctr, Photon Initiat, New York, NY 10031 USA
[3] City Univ New York, Phys Program, Grad Ctr, New York, NY 10016 USA
基金
中国国家自然科学基金; 国家重点研发计划;
关键词
metasurfaces; phase engineering; sound transparency; water-to-air eavesdropping; COMMUNICATION; SONGS;
D O I
10.1002/adma.202301799
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Efficiently receiving underwater sound remotely from air is a long-standing challenge in acoustics hindered by the large impedance mismatch at the water-air interface. Here, a phase-engineered water-air impedance matching metasurface is proposed and experimentally demonstrated for remote and efficient water-to-air eavesdropping. The judiciously designed metasurface with near-unity transmission efficiency, long monitoring distance, and high mechanical stiffness is capable of making the water-air interface acoustically transparent and, at the same time, freewheelingly patterning the transmitted wavefront. This enables efficient control over the effective spatial location of a distant airborne sensor such that it can measure underwater signals with large signal-to-noise ratios as if placed close to the physical underwater source. Such airborne eavesdropping of underwater sound is experimentally demonstrated with a measured sensitivity enhancement of nearly 10(4) at 8 kHz, far from achievable with the current state-of-the-art methods. Moreover, the opportunities of using the proposed metasurface for cross-media orbital-angular-momentum-multiplexed communication and underwater acoustic window are also demonstrated. This metasurface opens new avenues for communication and sensing in inhomogeneities with totally reflective interfaces, which may be translated to nano-optics and radio frequencies.
引用
收藏
页数:7
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