Vicinal Si(111) surfaces studied by optical second-harmonic generation: Step-induced anisotropy and surface-bulk discrimination
Вицинальные поверхности Si(111), исследованные методом генерации оптической второй гармоники: ступенчатая анизотропия и разделение поверхностного и объемного вкладов
1990-11-15
SCID: 54.1/ba833eak
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Nonlinear susceptibilityOptical second-harmonic generationStep-induced anisotropySurface-bulk discriminationVicinal Si(111) surfaces
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Abstract (AI)
By modifying a Si(111) surface through the introduction of a variable number of steps, the anisotropic surface and bulk contributions to the optical second-harmonic generation could be determined separately and were found to be of the same order of magnitude for a Si-${\mathrm{SiO}}_{2}$ interface. This approach is based on the lowering of the surface symmetry by the steps and by the apparent enhancement of the nonlinear susceptibility at the step edges.
Key Findings
1
For the Si–SiO₂ interface, surface and bulk second-harmonic-generation contributions are of the same order of magnitude.
2
Introducing a variable number of steps on Si(111) enables separate determination of anisotropic surface and bulk optical second-harmonic-generation contributions.
3
Steps lower the surface symmetry, producing measurable anisotropy in the optical second-harmonic response.
4
The nonlinear susceptibility appears enhanced at step edges, enabling surface–bulk discrimination.
Research Object
Vicinal Si(111) surfaces with variable numbers of steps at a Si–SiO₂ interface
Research Subject
Step-induced anisotropy and separate determination of surface and bulk optical second-harmonic-generation contributions, including nonlinear susceptibility enhancement at step edges
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1990-11-15
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