Speaker: Jinhee Kwon, University of Texas at Austin
Date & Time: July 17, 2006 - 10:30am
Location: NPL Conference Room 201
Reflectance-Anisotropy Spectroscopy (RAS) and Second-Harmonic Generation (SHG) from silicon step-edges
Laboratory for Surface Modification
Jinhee Kwon, University of Texas at Austin
10:30 AM, NPL Conference Room 201
Abstract: Spectroscopic second-harmonic generation (SHG) and reflectance-anisotropy spectra (RAS) of native-oxidized vicinal Si(001) with off-cut angles 0, 4, 6, 8, and 10 degree and clean reconstructed Si(001):6 degree are presented. As a common microscopic model for SHG and RAS, we used a simplifies bond hyperpolarizability model. The spectra of first- and second-order hyperpolarizability are obtained as a result of applying the bond model to the SHG data. These hyperpolarizability spectra are used to reproduce RAS successfully, and compared with the corresponding inverted real and imaginary spectra using the nonlinear Kramers-Kronig relations, thus confirming the consistency of the developed bond model.