General analytical solution for photoacoustic effect with multilayers

Abstract

A general solution of the photoacoustic (PA) effect with multilayers is derived by using a fully thermally-mechanically coupled PA model. This expression takes thermal, mechanical, optical, and geometry properties of multilayers, as well as the thermal contact resistances between layers into consideration. The PA frequency is extended to the ultrasonic region. Therefore, the PA effect at high frequency and laser induced ultrasonic wave in multilayers can also be studied.