H. Tanaka et al., OPTICAL 2ND-HARMONIC INTENSITY IMAGE OF MULTILAYERED METAL-FILM PATTERNS, Progress in crystal growth and characterization of materials, 33(1-3), 1996, pp. 129-132
The images of multi-layered metal film patterns have been observed usi
ng a scanning SHG microscope. The contrast between the SH intensities
of one-layered and two layered domains was correlated with the contact
potential difference between the top layer and the underlayer metals.