Acoustic beam splitting in a sonic crystal around a directional band gap |
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| Authors: | Ahmet Cicek Olgun Adem Kaya Bulent Ulug |
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| Affiliation: | a Department of Physics, Faculty of Arts and Sciences, Mehmet Akif Ersoy University, Campus 15100, Burdur/Turkey;b Department of Computer Education and Educational Technology, Faculty of Education, Inonu University 44280, Malatya/Turkey;c Department of Physics, Faculty of Science, Akdeniz University, Campus 07058, Antalya/Turkey |
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| Abstract: | Beam splitting upon refraction in a triangular sonic crystal composed of aluminum cylinders in air is experimentally and numerically demonstrated to occur due to finite source size,which facilitates circumvention of a directional band gap.Experiments reveal that two distinct beams emerge at crystal output,in agreement with the numerical results obtained through the finite-element method.Beam splitting occurs at sufficiently-small source sizes comparable to lattice periodicity determined by the spatial gap width in reciprocal space.Split beams propagate in equal amplitude,whereas beam splitting is destructed for oblique incidence above a critical incidence angle. |
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| Keywords: | sonic crystal directional band gap source size beam splitting |
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