Memoirs of the Faculty of Engineering, Okayama University
Published by Faculty of Enginerring, Okayama University

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Memoirs of the School of Engineering, Okayama University

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

Maetani Noriaki Graduate School of Natural Science and Technology Okayama University
Kurose Tomoyuki Graduate School of Natural Science and Technology Okayama University
鶴田 健二 Graduate School of Natural Science and Technology Okayama University ORCID Kaken ID publons researchmap
抄録
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.
ISSN
1349-6115
NCID
AA12014085
NAID