The behavior of surface horizontally polarized shear waves (SH waves) in the composite multi-material structure with a periodic irregular and interface is investigated analytically present study. To unravel enshrouded features SH-wave propagation multi-layer structure, we consider model three distinct materials. In schematic problem, guiding layer (M-I) contains fluid-saturated porous materials...

Research into ultrasonic guided wave non-destructive testing for the long range inspection of large metallic structures is now well advanced. The main advantage of this method is that a large area can be covered from a given transducer position, so avoiding expensive scanning of all the structure surface. However, in the presence of attenuative coatings the test range can be dramatically reduce...

We report a simple, novel subdiffraction method, i.e. diffraction interference induced superfocusing in second-harmonic (SH) Talbot effect, to achieve focusing size of less than λSH/4 (or λpump/8) without involving evanescent waves or subwavelength apertures. By tailoring point spread functions with Fresnel diffraction interference, we observe periodic SH subdiffracted spots over a hundred of m...