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Information × Registration Number 0214U002370, 0113U004650 , R & D reports Title Development of nonlinear- optical diagnostic methods for solar nanocomposite materials. popup.stage_title Head Poroshin Volodimir Mikolayovich, Registration Date 29-01-2014 Organization Institute of physics NASU popup.description2 The new methods have been developed to investigate the indicatrix of scattering for the nano-structured objects which are promising for the solar energetics and characterized by strong scattering and localization of light. It is shown that the diffusive scattering into the front hemisphere increases with growth of the quantum nano-threads length which correlates with data on the Raman scattering of light and generation of the 3rd harmonic. In the studies of scattering into the rear hemisphere one has established that the intensity of scattered light decreases with growth of the thread length. In the case of nano-threads having dimensions comparable with the wavelength one observes a curl of modes of the Fabri-Perot template connected the silicon substrate. The dependence of the real part of the cubic non-linear permittivity of the composite material on the thickness of the quantum nano-threads layer has been investigated under the pico-second laser excitation at the 1064 nm wavelength. It is shown that the efficiency of photo-induced changes of the optical absorption under self-action of the laser pulses increases by two times as compared to the crystalline silicon due to the effect of light localization. The non-linear optical response of the porous silicon functionalized by the model surfactants under the ps laser excitation has been studied. One observed a significant dependence of the absorption magnitude and refraction sign in comparison to the non-modified por-Si. The proposed technique may be used for diagnostics of the interface states. The new methods to investigate kinetics of the electron recombination processes in the silicon nano-threads in the femto- and pico-second ranges have been developed. Product Description popup.authors Блонський Іван Васильович Бродин Михайло Семенович Гайворонський Володимир Ярославович Головченко Олена Миколаївна Мультян Володимир Вікторович Попов Олександр Сергійович Порошин Володимир Миколайович Уклеін Андрій Володимирович popup.nrat_date 2020-04-02 Close