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Proceedings Paper

Local field effect in the second harmonic generation spectra of Si surfaces
Author(s): Bernardo S. Mendoza
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Paper Abstract

We calculate the SHG spectra of Si(100) and (111) surfaces taking account of the non-linear surface local field effect. Our model consists of four interpenetrated FCC lattices of bonds, each of which is centrosymmetric, but responds nonlinearly to the spatial inhomogeneities of the polarizing local field. The gradient of the field induced at a bond due to the dipole moment of a neighbor leads to a second order polarization which is canceled out in the bulk after summing over all other bonds, but it is not compensated at the surface, where it leads to a large nonlinear macroscopic response. Our model parameters are fitted to the nonlinear anisotropy measured at 1.17 and 2.34 eV. We calculate a linear anisotropy spectra for the (110) surface in agreement with experiment. Our nonlinear spectra shows peaks at 1.65 eV for a strained (100) surface and at 1.75 eV for a (111) surface, in agreement with recent experimental results.

Paper Details

Date Published: 1 September 1996
PDF: 2 pages
Proc. SPIE 2778, 17th Congress of the International Commission for Optics: Optics for Science and New Technology, 2778AE (1 September 1996); doi: 10.1117/12.2316063
Show Author Affiliations
Bernardo S. Mendoza, Ctr. de Investigaciones en Óptica, A.C. (Mexico)


Published in SPIE Proceedings Vol. 2778:
17th Congress of the International Commission for Optics: Optics for Science and New Technology
Joon-Sung Chang; Jai-Hyung Lee; ChangHee Nam, Editor(s)

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