Local field effect in the second harmonic generation spectra of Si surfaces

Bernardo S. Mendoza

doi:10.1117/12.2316063

1 September 1996 Local field effect in the second harmonic generation spectra of Si surfaces

Bernardo S. Mendoza

Proceedings Volume 2778, 17th Congress of the International Commission for Optics: Optics for Science and New Technology; 2778AE (1996) https://doi.org/10.1117/12.2316063
Event: 17th Congress of the International Commission for Optics: Optics for Science and New Technology, 1996, Taejon, Korea, Republic of

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.

Citation Download Citation

Bernardo S. Mendoza "Local field effect in the second harmonic generation spectra of Si surfaces", Proc. SPIE 2778, 17th Congress of the International Commission for Optics: Optics for Science and New Technology, 2778AE (1 September 1996); https://doi.org/10.1117/12.2316063

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