Voloshinov Vitaly B, Polikarpova Nataliya V, Declercq Nico F
Department of Physics, MV Lomonosov Moscow State University, Moscow, Russia.
J Acoust Soc Am. 2009 Feb;125(2):772-9. doi: 10.1121/1.3050307.
Propagation and reflection of plane elastic waves in the acousto-optic crystals tellurium dioxide, rutile, barium titanate, and mercury halides are examined in the paper. The reflection from a free and flat boundary separating the crystals and the vacuum is investigated in the (001) planes in the case of glancing acoustic incidence on the boundary. The analysis shows that two bulk elastic waves may be reflected from the crystal surface. The energy flow of one of the reflected waves in paratellurite and in the mercury compounds propagates in a quasi-back-direction with respect to the incident energy flow. It is proved that energy flows of the incident and reflected elastic waves are separated by a narrow angle of only a few degrees. It is also found that the relative intensity of the unusually reflected waves is close to a unit in a wide variety of crystal cuts. General conclusions related to acoustic propagation and reflection in crystals have been made based on the examined phenomena in the materials.
本文研究了平面弹性波在声光晶体二氧化碲、金红石、钛酸钡和卤化汞中的传播和反射。在边界处掠角声入射的情况下，研究了晶体与真空之间自由且平坦边界的反射，具体是在（001）平面中进行研究。分析表明，两种体弹性波可能会从晶体表面反射。在副碲酸盐和汞化合物中，其中一种反射波的能量流相对于入射能量流以准反向传播。证明了入射弹性波和反射弹性波的能量流仅被一个仅几度的窄角分开。还发现，在各种晶体切割中，异常反射波的相对强度接近单位值。基于材料中所研究的现象，得出了与晶体中声传播和反射相关的一般结论。
