中国物理B ›› 2019, Vol. 28 ›› Issue (2): 24301-024301.doi: 10.1088/1674-1056/28/2/024301

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Manipulation of acoustic wavefront by transmissive metasurface based on pentamode metamaterials

Ying Liu(刘颖), Yi-Feng Li(李义丰), Xiao-Zhou Liu(刘晓宙)   

  1. 1 College of Computer Science and Technology, Nanjing Tech University, Nanjing 211800, China;
    2 Key Laboratory of Modern Acoustics, Ministry of Education, Nanjing University, Nanjing 210093, China;
    3 Key Laboratory of Modern Acoustics, Ministry of Education, Institute of Acoustics and School of Physics, Nanjing University, Nanjing 210093, China
  • 收稿日期:2018-10-12 修回日期:2018-11-26 出版日期:2019-02-05 发布日期:2019-02-05
  • 通讯作者: Yi-Feng Li E-mail:lyffz4637@163.com
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61571222 and 11474160), the Natural Science Foundation of Jiangsu Province, China (Grant No. BK20161009), and the Six-Talent Peaks Project of Jiangsu Province, China.

Manipulation of acoustic wavefront by transmissive metasurface based on pentamode metamaterials

Ying Liu(刘颖)1, Yi-Feng Li(李义丰)1,2, Xiao-Zhou Liu(刘晓宙)3   

  1. 1 College of Computer Science and Technology, Nanjing Tech University, Nanjing 211800, China;
    2 Key Laboratory of Modern Acoustics, Ministry of Education, Nanjing University, Nanjing 210093, China;
    3 Key Laboratory of Modern Acoustics, Ministry of Education, Institute of Acoustics and School of Physics, Nanjing University, Nanjing 210093, China
  • Received:2018-10-12 Revised:2018-11-26 Online:2019-02-05 Published:2019-02-05
  • Contact: Yi-Feng Li E-mail:lyffz4637@163.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 61571222 and 11474160), the Natural Science Foundation of Jiangsu Province, China (Grant No. BK20161009), and the Six-Talent Peaks Project of Jiangsu Province, China.

摘要: An underwater acoustic metasurface with sub-wavelength thickness is designed for acoustic wavefront manipulation. In this paper, a pentamode lattice and a frequency-independent generalized acoustic Snell's law are introduced to overcome the limitations of narrow bandwidth and low transmittance. The bulk modulus and effective density of each unit cell can be tuned simultaneously, which are modulated to guarantee the achievement of refractive index profile and high transmission. Here, we actualize anomalous refraction, generation of non-diffracting Bessel beam, sub-wavelength flat focusing, and surface wave conversion by constructing inhomogeneous acoustic metasurface. This design approach has potential applications in medical ultrasound imaging and underwater acoustic communications.

关键词: metasurface, frequency-independent, pentamode, high transmission

Abstract: An underwater acoustic metasurface with sub-wavelength thickness is designed for acoustic wavefront manipulation. In this paper, a pentamode lattice and a frequency-independent generalized acoustic Snell's law are introduced to overcome the limitations of narrow bandwidth and low transmittance. The bulk modulus and effective density of each unit cell can be tuned simultaneously, which are modulated to guarantee the achievement of refractive index profile and high transmission. Here, we actualize anomalous refraction, generation of non-diffracting Bessel beam, sub-wavelength flat focusing, and surface wave conversion by constructing inhomogeneous acoustic metasurface. This design approach has potential applications in medical ultrasound imaging and underwater acoustic communications.

Key words: metasurface, frequency-independent, pentamode, high transmission

中图分类号:  (Ultrasonics, quantum acoustics, and physical effects of sound)

  • 43.35.+d
43.20.+g (General linear acoustics) 68.60.Bs (Mechanical and acoustical properties)