Wide-band all-angle acoustic self-collimation by rectangular sonic crystals with elliptical bases
JOURNAL OF PHYSICS D-APPLIED PHYSICS, cilt.44, sa.20, 2011 (SCI-Expanded)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 44 Sayı: 20
- Basım Tarihi: 2011
- Doi Numarası: 10.1088/0022-3727/44/20/205104
- Dergi Adı: JOURNAL OF PHYSICS D-APPLIED PHYSICS
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Akdeniz Üniversitesi Adresli: Evet
Özet
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.