Focusing with two-dimensional angular-symmetric circular acoustic lenses

Olgun Adem Kaya, Ahmet Cicek, Bulent Ulug

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)292-300
Number of pages9
JournalAcoustical Physics
Volume57
Issue number3
DOIs
Publication statusPublished - May 2011
Externally publishedYes

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