Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 44, Issue 20, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0022-3727/44/20/205104
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Funding
- Akdeniz University Scientific Research Projects Coordination Unit
- Inonu University Scientific Research Projects Unit
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Self-collimation of acoustic waves in the whole angular range of +/- 90 degrees. in the second and third bands of a two-dimensional rectangular sonic crystal with elliptical basis is demonstrated by examining the band structure and equifrequency contours. 70% and 77% of the second and third bands are available for wide-band all-angle self-collimation spanning a bandwidth of approximately 29% and 25% of the central frequencies of the all-angle self-collimation frequency ranges, respectively. Self-collimation of waves over large distances with a small divergence of beam width in the transverse direction is demonstrated through computations based on the finite element method. The second and third bands available for self-collimation are seen to vary linearly in the vast mid-range where a small group velocity dispersion prevents temporal divergence of waves with different frequencies.
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