Chin. Phys. B ›› 2012, Vol. 21 ›› Issue (12): 126202-126202.doi: 10.1088/1674-1056/21/12/126202

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Effects of wave propagation anisotropy on the wave focusing by negative refractive sonic crystal flat lenses

S. Alagoz   

  1. Department of Physics, Inonu University, Center Campus, Turkey
  • 收稿日期:2012-04-19 修回日期:2012-05-15 出版日期:2012-11-01 发布日期:2012-11-01

Effects of wave propagation anisotropy on the wave focusing by negative refractive sonic crystal flat lenses

S. Alagoz   

  1. Department of Physics, Inonu University, Center Campus, Turkey
  • Received:2012-04-19 Revised:2012-05-15 Online:2012-11-01 Published:2012-11-01
  • Contact: S. Alagoz E-mail:serkan.alagoz@inonu.edu.tr

摘要: In this study, wave propagation anisotropy in a triangular lattice crystal structure and its associated waveform shaping in a crystal structure are investigated theoretically. A directional variation in wave velocity inside a crystal structure is shown to cause bending wave envelopes. The authors report that a triangular lattice sonic crystal possesses six numbers of a high symmetry direction, which leads to a wave convergence caused by wave velocity anisotropy inside the crystal. However, two of them are utilized mostly in wave focusing by an acoustic flat lens. Based on wave velocity anisotropy, the pseudo ideal imagining effect obtained in the second band of the flat lens is discussed.

关键词: sonic crystal, wave focusing, flat lens, ideal imaging

Abstract: In this study, wave propagation anisotropy in a triangular lattice crystal structure and its associated waveform shaping in a crystal structure are investigated theoretically. A directional variation in wave velocity inside a crystal structure is shown to cause bending wave envelopes. The authors report that a triangular lattice sonic crystal possesses six numbers of a high symmetry direction, which leads to a wave convergence caused by wave velocity anisotropy inside the crystal. However, two of them are utilized mostly in wave focusing by an acoustic flat lens. Based on wave velocity anisotropy, the pseudo ideal imagining effect obtained in the second band of the flat lens is discussed.

Key words: sonic crystal, wave focusing, flat lens, ideal imaging

中图分类号:  (Acoustical properties of solids)

  • 62.65.+k
43.20.El (Reflection, refraction, diffraction of acoustic waves) 43.35.Cg (Ultrasonic velocity, dispersion, scattering, diffraction, and Attenuation in solids; elastic constants)