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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Editor: Henry van Driel
  • Vol. 27, Iss. 5 — May. 1, 2010
  • pp: 981–989

Optical second-harmonic and reflectance-anisotropy spectroscopy of clean and hydrogen-terminated vicinal Si(001) surfaces

Robert Ehlert, Jinhee Kwon, Loucas Loumakos, Onise Sharia, Alexander A. Demkov, and M. C. Downer  »View Author Affiliations

JOSA B, Vol. 27, Issue 5, pp. 981-989 (2010)

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Spectroscopic second-harmonic generation (SHG) and reflectance-anisotropy spectroscopy are used to probe a single-domain reconstructed stepped Si(001) surface off cut 6° toward [110] before and after dissociative adsorption of H 2 at the D B step edges. The reflectance-anisotropy spectrum and the first- and third-order Fourier components of the SHG azimuthal anisotropy exhibit broad step-induced resonant peaks near 3.1 eV that are quenched in approximate proportion to H 2 dosage, suggesting that they all share a common origin in the essential electronic resonance of the D B steps. Analysis with a simplified bond-hyperpolarizability model suggests that hydrogen termination redistributes oscillator strength from the chemically active nearly vertical step dangling bond into three underlying bonds, suggesting the latter may be related to the third-order Fourier component of the SHG response.

© 2010 Optical Society of America

OCIS Codes
(240.4350) Optics at surfaces : Nonlinear optics at surfaces
(240.6490) Optics at surfaces : Spectroscopy, surface
(240.5698) Optics at surfaces : Reflectance anisotropy spectroscopy

ToC Category:
Optics at Surfaces

Original Manuscript: December 1, 2009
Revised Manuscript: February 18, 2010
Manuscript Accepted: February 22, 2010
Published: April 22, 2010

Robert Ehlert, Jinhee Kwon, Loucas Loumakos, Onise Sharia, Alexander A. Demkov, and M. C. Downer, "Optical second-harmonic and reflectance-anisotropy spectroscopy of clean and hydrogen-terminated vicinal Si(001) surfaces," J. Opt. Soc. Am. B 27, 981-989 (2010)

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