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Current issue   Ukr. J. Phys. 2014, Vol. 58, N 12, p.1132-1137
doi:10.15407/ujpe58.12.1132    Paper

Uklein A.V., Multian V.V., Gayvoronsky V.Ya.

Institute of Physics, Nat. Acad. of Sci. of Ukraine
(46, Nauky Prosp., Kyiv 03680, Ukraine; e-mail: uklein@iop.kiev.ua)

Linear and Nonlinear Optical Characterizations of TiO2-Based Hybrids at the Self-Action of CW Laser Irradiation and Picosecond Laser Pulses

Section: Optics, lasers, and quantum electronics
Original Author's Text: English

Abstract: The impact of the concentration of TiO2 nanoparticles on the optical and nonlinear optical (NLO) response of TiO2-based hybrids is studied. The characterization of variations of the optical scattering, photoinduced absorption, and refractive index under the excitation of continuous (CW) and picosecond laser pulses of studied samples is performed. The manifestation of the cooperative effect of nanoparticles at concentrations higher 4.4 x 1020 cm-3 of Ti atoms is observed. The effect is accompanied with the enhancement of the efficiency of charge separation processes at the organic-inorganic interface and with the photoinduced Ti3+ centers polarizability reduction. The observed results indicate the optimal titanium concentration about 4.4 x 1020 cm-3 for the photonics application.

Key words: nonlinear optical response, self-action effect, cubic nonlinear optical susceptibility, charge separation efficiency