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Polarization‐sensitive third‐harmonic generation in birefringent (110) porous silicon layers reveals a modification in the cubic susceptibility tensor of silicon caused by strongly anisotropic pores. The ratio (χ ₁₁₁₁ ⁽³⁾ + χ ₁₁₂₂ ⁽³⁾ / χ ₃₃₃₃ ⁽³⁾) of cubic susceptibility tensor components for the porous layers is shown to be 40% higher than this ratio for crystalline silicon. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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Zabotnov et al. (2005) studied this question.
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