Theoretical study for detection of defects in weakly absorbing samples by crossed-beam photothermal technique

摘要

The photothermal techniques have been successfully applied as tools for nondestructive evaluation (NDE) of inhomogeneous materials. For optically opaque samples, photothermal techniques are widely used for detection and characterization of subsurface defects and interfaces within the samples [1,2]. For optically transparent samples, photothermal techniques are used for absorption mapping of thin films deposited on optical substrates [3], biological and medical samples [4]. Due to nondestructive micro-analyses is very important for studies of thin films and interfaces, as well as biological, and medical samples.