Guided waves in stratified media: Observing multiple Sezawa modes

Appearance of multiple Sezawa (M-2,M-2) modes and the related interfacial Stoneley waves at propagation of Lamb wave in a stratified medium containing several layers obeying Wiechert condition is observed. Possible appearance of the multiple high frequency Stoneley and Sezawa modes may have importance in various applications starting from micro and nanomechanics to geophysics along with developing the nondestructive acoustic methods for qualitative and quantitative assessment of the high frequency asymptotics. The analysis is based on Cauchy sextic formalism.

Automated summary

The observation of the appearance of multiple Sezawa (M-2, M-2) modes and related interfacial Stoneley waves in a stratified medium obeying the Wiechert condition during the propagation of Lamb waves is reported. The possible presence of multiple high-frequency Stoneley and Sezawa modes is significant in various fields, from micro and nanomechanics to geophysics, and also contributes to the development of nondestructive acoustic methods for qualitative and quantitative assessment of high-frequency asymptotics. The analysis is based on the Cauchy sextic formalism.