Glancing incidence and back reflection of elastic waves in tetragonal crystals

Nataliya V. Polikarpova; Vitaly B. Voloshinov

doi:10.1117/12.622208

29 September 2005 Glancing incidence and back reflection of elastic waves in tetragonal crystals

Nataliya V. Polikarpova, Vitaly B. Voloshinov

Proceedings Volume 5953, Acousto-optics and Photoacoustics; 59530C (2005) https://doi.org/10.1117/12.622208
Event: Congress on Optics and Optoelectronics, 2005, Warsaw, Poland

Abstract

Propagation and reflection of plane acoustic waves in crystals of similar tetragonal symmetry but different grade of elastic anisotropy is examined. The reflection of the waves from a homogeneous and flat boundary separating a crystal and the vacuum in the case of glancing acoustic incidence is investigated. As much as two elastic waves may be reflected from the crystal surface. It is predicted that in the materials with a strong anisotropy of elastic properties, the energy flow of one of the reflected waves propagates in a quasi-back direction with respect to the incident energy flow. It is found that the energy flows of the incident and the back reflected waves are separated in space by the angle as narrow as a few degrees. Analysis proves that the relative intensity of the unusually reflected wave may be close to a unit. A decrease in the grade of the anisotropy in a crystal results in vanishing of the backward reflected wave so that its energy fraction is diminishing down to zero. A regular trend is predicted that the effect of the unusual reflection increases with the growth of the grade of the elastic anisotropy.

Citation Download Citation

Nataliya V. Polikarpova and Vitaly B. Voloshinov "Glancing incidence and back reflection of elastic waves in tetragonal crystals", Proc. SPIE 5953, Acousto-optics and Photoacoustics, 59530C (29 September 2005); https://doi.org/10.1117/12.622208

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