LEAKY WAVES AND THE ELASTIC-WAVE RESONANCE REFLECTION ON A CRYSTAL-THIN SOLID LAYER INTERFACE - II - LEAKY WAVES GIVEN RISE TO BY EXCEPTIONAL BULK WAVES

A study is made of the elastic wave resonance reflection in a crystal- thin solid layer structure near the velocity of a leaky wave which ori ginates from an exceptional bulk wave. The latter is a homogeneous mod e with group velocity parallel to the boundary of a medium which satis fies the condition of the mechanically free surface. On the surface co ated with a thin layer, the exceptional bulk wave can transform into t he leaky wave and then there arises a narrow interval of incident angl es where the coefficients of mode conversion suffer abrupt and strong variations in phase and magnitude. A criterion of occurence of the lea ky wave is found. Approximate expressions describing the behavior of t he coefficients of mode conversion within the resonance interval of in cident angles are derived and analyzed. (C) 1998 Acoustical Society of America.