Self-collimated slow sound in sonic crystals

Olgun Adem Kaya, Ahmet Cicek, Bulent Ulug

Araştırma sonucu: Dergi katkısıMakalebilirkişi

22 Alıntılar (Scopus)

Özet

Self-collimated slow-sound propagation in a two-dimensional rectangular sonic crystal composed of elliptical scatterers in air is numerically demonstrated. The group velocity at the centre and the edges of the fourth acoustic band is reduced to 45ms -1 and 30ms -1, corresponding to 1/8 and 1/12 of the speed of sound in air, respectively. Elimination of omni-directional reflections encountered in linear waveguides and the reduction of group-velocity dispersion at the mid-band frequencies lead to preservation of pulse shape and amplitude upon traversal of the sonic crystal. Wave transmission is increased from approximately -20 to -2.5dB, with almost an order of magnitude enhancement, via injector layers optimized through a pattern search algorithm. Self-collimating performance of the system is not degraded under oblique incidence, except for pulse broadening due to increased effective source width.

Orijinal dilİngilizce
Makale numarası365101
DergiJournal of Physics D: Applied Physics
Hacim45
Basın numarası36
DOI'lar
Yayın durumuYayınlanan - 5 Eyl 2012
Harici olarak yayınlandıEvet

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