Bulk and interface contributions to the optical second-harmonic response of native-oxide-covered vicinal Si(111)

• Published in: Physica Status Solidi (b) Vol. 242; no. 15; pp. 3012 - 3016
• Main Authors: McGilp, J. F., Carroll, L.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Berlin WILEY-VCH Verlag 01-12-2005; WILEY‐VCH Verlag; Wiley
• Subjects: 42.65.An; 42.65.Ky; 68.35.Ct; 78.68.+m; Exact sciences and technology; Frequency conversion ; harmonic generation, including high-order harmonic generation; Fundamental areas of phenomenology (including applications); Nonlinear optics; Optics; Physics; Interfaces; Second harmonic generation; Polarization; Laser pulse; Laser radiation; Silicon oxides; Oxidation; Silicon; Hyperpolarization
• ISSN: 0370-1972; 1521-3951
• DOI: 10.1002/pssb.200562215

The optical second‐harmonic response of native‐oxide‐covered vicinal Si(111), offcut by 3° towards [$ \bar 1 $$ \bar 1 $2], is compared with previous work at the same wavelength on similar samples, but offcut by 5° in the opposite, [11$ \bar 2 $], direction. Sample rotation plots for sS, pS, sP and pP polarisation combinations are reported using 130 fs laser pulses of 765 nm wavelength, where mN indicates m‐polarised input and N‐polarised SH output. The two offcuts have different step geometries, but the same terrace structure at the Si/SiO2 interface. In addition, the bulk quadrupolar contributions from the two offcuts are related by simple geometric factors. By using these constraints, simultaneous fitting of eight rotation plots allows the bulk and interface contributions to be estimated. These results offer the possibility of more detailed investigation of bond hyperpolarisability models, which have been applied recently to the vicinal Si/SiO2 interface. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)