Focusing with two-dimensional angular-symmetric circular acoustic lenses

Olgun Adem Kaya, Ahmet Cicek, Bulent Ulug

Araştırma sonucu: Dergi katkısıMakalebilirkişi

7 Alıntılar (Scopus)

Özet

Focusing properties of an acoustic lens based on a modified triangular sonic crystal slab whose columns are aligned on concentric arcs of equal radial distance are investigated. Capability of focusing normally-incident plane waves is demonstrated by means of Finite Element Method. Focusing mechanisms are discussed on the basis of band structures and equifrequency contours considering a model where triangular lattice is elongated along ΓK direction. Focusing behavior of the proposed lens is argued to arise from negative refractions at the air-lens interfaces accompanied by index guiding in its interiors. Wavelength-order confinement in the transverse direction is observed. Double focusing is attributed to geometrical effects and contribution of self guiding is discussed. Possibility of occurrence of birefraction at the input face of the lens together with positive refraction at the output face is also discussed.

Orijinal dilİngilizce
Sayfa (başlangıç-bitiş)292-300
Sayfa sayısı9
DergiAcoustical Physics
Hacim57
Basın numarası3
DOI'lar
Yayın durumuYayınlanan - May 2011
Harici olarak yayınlandıEvet

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