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

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概要

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• 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.

• Faculty of Engineering, Okayama Universityの論文

著者

• Tsuruta Kenji

  Okayama Univ. Okayama Jpn

関連論文

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