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Manipulating Acoustic Focus with an Active Metasurface Piezoelectric Transducer

  • Jiajun ZhaoEmail author
Chapter
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Part of the Springer Theses book series (Springer Theses)

Abstract

This chapter establishes the prototype of acoustic metasurface piezoelectric transducer (PT), whose piezoelectric elements are squeezed into a flat thin layer compared to the scale of the entire device. The active planar interface also extends the knowledge of acoustic metasurface engineering for the deflection of sound beams using passive elements (Li et al., Sci Rep 3:2546, 2013, [1], Zhao, Appl Phys Lett 103(15):151604, 2013, [2]). Through the optimized ring configurations of the active metasurface PT, we are able to manipulate the focal pattern and the focal resolution in acoustic far fields. Firstly, we design the far-field finite-length focal needle with the manipulated distance and depth. Its focal resolution is subwavelength for the full width at half maximum (FWHM), and it propagates without divergence for a distance of 5.9\(\lambda \) as designed, longer than the depth 4\(\lambda \) of the reported optical needle (Wang, Nat. Photonics 2(8):501–505, 2008, [3]). These two designed focusing properties created with PTs were never achieved in acoustics, to the best of our knowledge. To further verify the robustness of our manipulation of the focal pattern, via another optimized ring configuration, we obtain the designed far-field multiple foci, whose FWHM (0.45\(\lambda \)) beats the Rayleigh diffraction limit of conventional acoustic instruments (0.5\(\lambda \)). Besides, to demonstrate the manipulation of the focal resolution, we design the extreme case of the super-oscillatory super resolution, whose size is 0.3\(\lambda \) in acoustic far fields, much smaller than the diffraction limit.

Keywords

Piezoelectric Transducer Diffraction Limit Binary Particle Swarm Optimization Sound Beam Focal Pattern 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. 1.
    Y. Li, B. Liang, Z.-M. Gu, X.-Y. Zou, J.-C. Cheng, Reflected wavefront manipulation based on ultrathin planar acoustic metasurfaces. Sci. Rep. 3, 2546 (2013)Google Scholar
  2. 2.
    J. Zhao, B. Li, Z.N. Chen, C.-W. Qiu, Redirection of sound waves using acoustic metasurface. Appl. Phys. Lett. 103(15), 151604 (2013)CrossRefGoogle Scholar
  3. 3.
    H. Wang, L. Shi, B. Lukyanchuk, C. Sheppard, C.T. Chong, Creation of a needle of longitudinally polarized light in vacuum using binary optics. Nat. Photonics 2(8), 501–505 (2008)CrossRefGoogle Scholar
  4. 4.
    R. Castellano, L. Feinstein, Ion-beam deposition of thin films of ferroelectric lead zirconate titanate (pzt). J. Appl. Phys. 50(6), 4406–4411 (1979)CrossRefGoogle Scholar
  5. 5.
    J. Zhao, H. Ye, K. Huang, Z.N. Chen, B. Li, C.-W. Qiu, Manipulation of acoustic focusing with an active and configurable planar metasurface transducer. Sci. Rep. 4, 6257 (2014)CrossRefGoogle Scholar
  6. 6.
    B.A. Auld, Acoustic Fields and Waves in Solids, vol. 2 (RE Krieger, Malabar, 1990)Google Scholar
  7. 7.
    E.T. Rogers, J. Lindberg, T. Roy, S. Savo, J.E. Chad, M.R. Dennis, N.I. Zheludev, A super-oscillatory lens optical microscope for subwavelength imaging. Nat. Mater. 11(5), 432–435 (2012)CrossRefGoogle Scholar
  8. 8.
    H. Ye, C.-W. Qiu, K. Huang, J. Teng, B. Lukyanchuk, S.P. Yeo, Creation of a longitudinally polarized subwavelength hotspot with an ultra-thin planar lens: vectorial rayleigh-sommerfeld method. Laser Phys. Lett. 10(6), 065004 (2013)CrossRefGoogle Scholar
  9. 9.
    N. Jin, Y. Rahmat-Samii, Advances in particle swarm optimization for antenna designs: real-number, binary, single-objective and multiobjective implementations. IEEE Trans. Antennas Propag. 55(3), 556–567 (2007)CrossRefGoogle Scholar
  10. 10.
    D.T. Blackstock, Fundamentals of Physical Acoustics (Wiley, New York, 2000)Google Scholar
  11. 11.
    M. Born, E. Wolf, Principles of Optics: Electromagnetic Theory of Propagation, Interference and Diffraction of Light (Cambridge University Press, Cambridge, 1999)CrossRefGoogle Scholar
  12. 12.
    J.J. Sakurai, J. Napolitano, Modern Quantum Mechanics (Addison-Wesley, Boston, 2011)Google Scholar
  13. 13.
    K. Huang, H. Ye, J. Teng, S.P. Yeo, B. Luk’yanchuk, C.-W. Qiu, Optimization-free superoscillatory lens using phase and amplitude masks. Laser Photonics Rev. 8(1), 152–157 (2014)CrossRefGoogle Scholar
  14. 14.
    Y. Li, B. Liang, X. Tao, X.-F. Zhu, X.-Y. Zou, J.-C. Cheng, Acoustic focusing by coiling up space. Appl. Phys. Lett. 101(23), 233508 (2012)CrossRefGoogle Scholar
  15. 15.
    E.T. Rogers, S. Savo, J. Lindberg, T. Roy, M.R. Dennis, N.I. Zheludev, Super-oscillatory optical needle. Appl. Phys. Lett. 102(3), 031108 (2013)CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Singapore 2016

Authors and Affiliations

  1. 1.Department of Electrical and Computer EngineeringNational University of SingaporeSingaporeSingapore

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