Physical modeling and validation of porpoises’ directional emission via hybrid metamaterials

ABSTRACT In wave physics and engineering, directional emission sets a fundamental limitation on conventional simple sources as their sizes should be sufficiently larger than their wavelength. Artificial metamaterial and animal biosonar both show potential in overcoming this limitation. Existing metamaterials arranged in periodic microstructures face great challenges in realizing complex and multiphase biosonar structures. Here, we proposed a physical directional emission model to bridge the gap between porpoises’ biosonar and artificial metamaterial. Inspired by the anatomical and physical properties of the porpoise's biosonar transmission system, we fabricated a hybrid metamaterial system composed of multiple composite structures. We validated that the hybrid metamaterial significantly increased directivity and main lobe energy over a broad bandwidth both numerically and experimentally. The device displayed efficiency in detecting underwater target and suppressing false target jamming. The metamaterial-based physical model may be helpful to achieve the physical mechanisms of porpoise biosonar detection and has diverse applications in underwater acoustic sensing, ultrasound scanning, and medical ultrasonography.

[1]  J. Christensen,et al.  Directional Acoustic Antennas Based on Valley‐Hall Topological Insulators , 2018, Advanced materials.

[2]  N. Fang,et al.  Breaking the barriers: advances in acoustic functional materials , 2018 .

[3]  Shi-ning Zhu,et al.  Metamaterials: artificial materials beyond nature , 2018 .

[4]  Yu Zhang,et al.  Directional Acoustic Wave Manipulation by a Porpoise via Multiphase Forehead Structure , 2017 .

[5]  Y. Wang,et al.  Observation of acoustic Dirac-like cone and double zero refractive index , 2017, Nature Communications.

[6]  Chong Wei,et al.  Reconstruction of the forehead acoustic properties in an Indo-Pacific humpback dolphin (Sousa chinensis), with investigation on the responses of soft tissue sound velocity to temperature. , 2017, The Journal of the Acoustical Society of America.

[7]  Peer Fischer,et al.  Holograms for acoustics , 2016, Nature.

[8]  Zhongchang Song,et al.  Inducing rostrum interfacial waves by fluid-solid coupling in a Chinese river dolphin (Lipotesvexillifer). , 2016, Physical review. E.

[9]  Nicholas X. Fang,et al.  Anisotropic Complementary Acoustic Metamaterial for Canceling out Aberrating Layers , 2014 .

[10]  Yan Li,et al.  A biomimetic projector with high subwavelength directivity based on dolphin biosonar , 2014 .

[11]  J. J. Park,et al.  Giant acoustic concentration by extraordinary transmission in zero-mass metamaterials. , 2013, Physical review letters.

[12]  F. J. García de abajo,et al.  Anisotropic metamaterials for full control of acoustic waves. , 2012, Physical review letters.

[13]  M. Fleischhauer,et al.  Dipole-dipole shift of quantum emitters coupled to surface plasmons of a nanowire , 2011, 1105.1018.

[14]  Chunguang Xia,et al.  Broadband acoustic cloak for ultrasound waves. , 2010, Physical review letters.

[15]  T. Jefferson,et al.  Revision of the taxonomy of finless porpoises (genus Neophocaena): The existence of two species , 2011 .

[16]  N. Fang,et al.  Focusing ultrasound with an acoustic metamaterial network. , 2009, Physical review letters.

[17]  A. Norris,et al.  Acoustic metafluids. , 2008, The Journal of the Acoustical Society of America.

[18]  Rolf Müller,et al.  Numerical study of the effect of the noseleaf on biosonar beamforming in a horseshoe bat. , 2007, Physical review. E, Statistical, nonlinear, and soft matter physics.

[19]  Weijia Wen,et al.  Effective Dynamic Mass Density of Composites , 2007 .

[20]  D. Torrent,et al.  Acoustic metamaterials for new two-dimensional sonic devices , 2007 .

[21]  Andreas Håkansson,et al.  Directional acoustic source by scattering acoustical elements , 2007 .

[22]  Daniel Torrent,et al.  Effective parameters of clusters of cylinders embedded in a nonviscous fluid or gas , 2006 .

[23]  N. Fang,et al.  Ultrasonic metamaterials with negative modulus , 2006, Nature materials.

[24]  Andreas Håkansson,et al.  Homogenization of two-dimensional clusters of rigid rods in air. , 2006, Physical review letters.

[25]  TARGET DISCRIMINATION BY AN ECHOLOCATING FINLESS PORPOISE, NEOPHOCAENA PHOCAENOIDES , 1997 .

[26]  Whitlow W. L. Au,et al.  The Sonar of Dolphins , 1993, Springer New York.