Guest Editors
Prof. Tuo Liu, Institute of Acoustics, Chinese Academy of Sciences, China
Dr. Tuo Liu is an Associate Professor at the Institute of Acoustics, Chinese Academy of Sciences. He received his BSc degree in Acoustics from Nanjing University in 2010 and an MSc degree in Physics from China University of Petroleum (Beijing) in 2013. After graduation, he worked as an acoustic engineer in the industry for about one year. In 2018, he obtained his Ph.D. degree in the Department of Mechanical Engineering, The Hong Kong Polytechnic University. From 2018 to 2022, he worked as a research associate and a postdoctoral fellow and was then appointed as a Research Assistant Professor in the same department. Dr. Liu's research interests focus on physical acoustics, acoustic metamaterials, non-Hermitian acoustics and other acoustics-related topics. He has secured various funds from The Hong Kong Polytechnic University, the Research Grant Council of Hong Kong, and the National Natural Science Foundation of China. He has authored and co-authored more than 30 peer-reviewed papers which were published in top-tier journals, including Physical Review Letters and Nature Physics. He is a member of the Acoustical Society of America and the Acoustical Society of China. He also serves as a reviewer for more than 20 journals in physics, acoustics, and mechanics.
Prof. Zhenbo Lu, School of Aeronautics and Astronautics, Sun Yat-Sen University, China
Prof. Zhenbo Lu is currently a professor in the School of Aeronautics and Astronautics, Sun Yat-Sen University, Shenzhen, China. He obtained his Bachelor's degree in Flight Vehicle Propulsion from Beijing University of Aeronautics and Astronautics (BUAA, 2003), Master of Engineering in Aerospace Propulsion Theory and Engineering from Beijing University of Aeronautics and Astronautics (BUAA, 2006), Doctor of Philosophy in Mechanical Engineering from the Hong Kong Polytechnic University (PolyU, 2012). He worked as a Research Scientist in the Temasek Laboratories, the National University of Singapore for six years (2012 to 2018) and was promoted to Senior Research Scientist from 2019 to 2020. His research interests include Acoustic metamaterials/metasurface, aerodynamics, aeroacoustics, smart bionic design and machine learning.
Summary
Acoustic metamaterial has recently gained much popularity in both the research and engineering communities owing to its advantages compared to conventional acoustic treatments. Generally, acoustic metamaterial possesses effective parameters not available in nature, such as negative mass density and/or negative bulk modulus, zero index, extreme anisotropy, active matter, etc. Such exotic effective parameters for wave propagation can be made possible by judiciously engineered unit cells of sizes much smaller than the wavelength, which provides many unconventional ways of acoustic wave manipulation ranging from invisible cloaking and illusion, bending waves in the "wrong" direction, to subwavelength focusing and imaging. Currently, there exist many different classes of acoustic metamaterials, including but not limited to locally resonant type, gradient-index type, phase shifting and sound absorbing metasurfaces, topological sonic crystals and metamaterials, and non-Hermitian and parity-time-symmetric materials. They have shown exciting potential in terms of sound wave manipulation in unprecedented manners, such as bandgap engineering and tunability, negative refraction, acoustic trapping, topologically protected waveguiding, and nonreciprocal or asymmetric scattering. This Special Issue covers these topics and any related emerging direction in this active field, especially focusing on the real-world engineering applications using acoustic metamaterials.
Potential topics include but are not limited to
• Modeling, fabrication and measurement of acoustic artificial structures/materials (metamaterials, metasurfaces, phononic/sonic crystals, etc.)
• Sound absorption and/or insulation metamaterials/metasurfaces
• Metamaterial-based subwavelength/super-resolution acoustic focusing and imaging
• Metamaterial-based wavefront modulation and vortex generation/detection
• Asymmetric or nonreciprocal acoustic wave propagation
• Topological phases of acoustic metamaterial and sonic crystals
• Non-Hermitian and parity-time-symmetric acoustic systems and exceptional points
• Other fundamental research and applications related to acoustic, elastic or mechanical metamaterials
Keywords
Acoustic metamaterials, elastic metamaterials, phononic/sonic crystals, acoustic metasurfaces, sound absorption and insulation, gradient-index metamaterials, nonreciprocal acoustics, non-linear metamaterials, active metamaterials, topological acoustics, non-Hermitian physics, parity-time symmetry.
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