Numerical Simulation of Acoustic Waves in a Two-Dimensional Phononic Crystal: Negative Refraction

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Abstract

The lens effect of acoustic waves in a two-dimensional (2D) phononic crystal is studied by numerical simulation based on the finite-difference time-domain (FDTD) method.We calculate the phonon band structure of 2D phononic crystals, consisting of metal cylinders placed periodically in water. Lens effect is observed by the negative refraction of acoustic waves, which results in refocusing of the waves at the point outside the crystal. To increase the focal intensity, we introduce a 2D phononic crystal shield with a different composition of material, which returns the incident waves back to the lens via the perfect reflection. Also, the dependence on filling fraction of metal in the crystal is studied.

Journal

  • Memoirs of the Faculty of Engineering, Okayama University

    Memoirs of the Faculty of Engineering, Okayama University (44), 7-12, 2010-01

    Faculty of Engineering, Okayama University

Codes

  • NII Article ID (NAID)
    120002309019
  • NII NACSIS-CAT ID (NCID)
    AA12014085
  • Text Lang
    ENG
  • Article Type
    departmental bulletin paper
  • ISSN
    1349-6115
  • Data Source
    IR 
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