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Chin. Phys. B, 2015, Vol. 24(4): 046201    DOI: 10.1088/1674-1056/24/4/046201
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES Prev   Next  

Negative refractions by triangular lattice sonic crystals in partial band gaps

S. Alagoza, B. B. Alagozb, A. Sahina, S. Nurc
a Department of Physics, Inonu University, Malatya, Turkey;
b Department of Electrical and Electronics Engineering, Inonu University, Malatya, Turkey;
c Vocational School of Health Services, Medical Imaging Techniques, Inonu University, Malatya, Turkey
Abstract  

This study numerically demonstrates the effects of partial band gaps on the negative refraction properties of sonic crystal. The partial band gap appearing at the second band edge leads to the efficient transmissions of scattered wave envelopes in the transverse directions inside triangular lattice sonic crystal, and therefore enhances the refraction property of sonic crystal. Numerical simulation results indicate a diagonal guidance of coupled scattered wave envelopes inside crystal structure at the partial band gap frequencies and then output waves are restored in the vicinity of the output interface of sonic crystal by combining phase coherent scattered waves according to Huygens' principles. This mechanism leads to two operations for wavefront engineering: one is spatial wavefront shifting operation and the other is convex-concave wavefront inversion operation. The effects of this mechanism on the negative refraction and wave focalization are investigated by using the finite difference time domain (FDTD) simulations. This study contributes to a better understanding of negative refraction and wave focusing mechanisms at the band edge frequencies, and shows the applications of the slab corner beam splitting and SC-air multilayer acoustic system.

Keywords:  sonic crystal      negative refraction      wave focusing      partial band gap  
Received:  17 July 2014      Revised:  04 September 2014      Accepted manuscript online: 
PACS:  62.65.+k (Acoustical properties of solids)  
  43.20.El (Reflection, refraction, diffraction of acoustic waves)  
  43.20.Mv (Waveguides, wave propagation in tubes and ducts)  
Fund: 

Project supported by the Inonu Universty Scientific Research Projects Coordination Unit (Grant Nos. 2012/29 and 2013/56).

Corresponding Authors:  S. Alagoz     E-mail:  serkan.alagoz@inonu.edu.tr

Cite this article: 

S. Alagoz, B. B. Alagoz, A. Sahin, S. Nur Negative refractions by triangular lattice sonic crystals in partial band gaps 2015 Chin. Phys. B 24 046201

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