Oa. Aktsipetrov et al., 2ND-HARMONIC GENERATION AND ATOMIC-FORCE MICROSCOPY STUDIES OF POROUSSILICON, Applied physics letters, 67(9), 1995, pp. 1191-1193
Structural properties of porous silicon were studied with atomic-force
microscopy (AFM) and optical second harmonic generation (SHG). Depend
ing on etching conditions, the SHG response was observed to be either
anisotropic, showing C-2v symmetry, or isotropic. This correlated with
AFM observations of quasi ordered structures in the first case. The S
i etching process was studied by in situ SHG measurements. (C) 1995 Am
erican Institute of Physics.