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- W1992456985 abstract "Anisotropic (elliptically polarized) photoinduced second harmonic generation (PISHG) in SiNxOy/Si〈111〉 films was proposed for contact-less monitoring of specimens with different nitrogen to oxygen (N/O) ratios. As a source for the photoinducing light, we used a nitrogen Q-switched pulse laser at wavelengths of 315, 337 and 354nm as well as doubled frequency YAG–Nd laser wavelength (λ=530nm). The YAG : Nd pulse laser (λ=1.06μm;W=30MW;τ=10–50ps) was used to measure the PISHG. All measurements were done in a reflected light regime. We found that the output PISHG signal was sensitive to the N/O ratio and the film thickness. Measurements of the PISHG versus pumping wavelengths, powers, incident angles as well as independent measurements of the DC-electric field induced second harmonic generation indicate the major role played in this process by axially symmetric photoexcited electron–phonon states. The SiNxOy films were synthesized using a technique of chemical evaporation at low pressures. Films with thickness varying between 10 and 30nm and with an N/O ratio between 0 and 1 were obtained. Electrostatic potential distribution at the Si〈111〉–SiNxOy interfaces was calculated. Comparison of the experimentally obtained and quantum chemically calculated PISHG data are presented. High sensitivity of anisotropic PISHG to the N/O ratio and film thickness is revealed. The role of the electron–phonon interactions in the dependencies observed is discussed. We have shown that the PISHG method has higher sensitivity than the traditional extended X-ray absorption fine structure spectroscopic and linear optical method for films with the N/O ratio higher than 0.50." @default.
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- W1992456985 date "2001-04-01" @default.
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- W1992456985 title "Photoinduced non-linear optical diagnostic of SiNxOy/Si〈111〉 interfaces" @default.
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- W1992456985 doi "https://doi.org/10.1016/s0143-8166(01)00011-2" @default.
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