5. Guided waves

The waves studied so far are volume waves: it is assumed here that the dimensions of the wave bundle are small compared with those of the medium. The limits of the medium play no role, except in 4 , where a "semi-infinite" solid, bounded by a plane surface, is used.

Waves of a given mode are usually reflected there, generating other modes and, in particular, in the case of the liquid-solid interface and under specific conditions of incidence,...