Giant nonlinear optical response of nanoporous anatase layers

Gayvoronsky, V. Ya.; Galas, A.; Shepelyavyy, E.; Dittrich, Th.; Timoshenko, V. Yu.; Nepijko, S.A.; Brodyn, M. S.; Koch, F.

doi:10.1007/s00340-004-1676-2

Cited by 55 publications

(32 citation statements)

References 15 publications

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“…Titanium dioxide (TiO 2 ) is a versatile semiconductor oxide from the view point of its potential applications such as photocatalyst [1,2], solar cell [3][4][5], gas sensor [6], NLO material [7] etc. It is expected to provide solution to many environmental issues like waste water treatment, air pollution and decomposition of toxic organic pollutants.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, structural and optical properties of well dispersed anatase TiO₂ nanoparticles by non‐hydrothermal method

Christy¹,

Jothi²,

Melikechi

et al. 2009

Cryst. Res. Technol.

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The formation of nanocrystalline TiO 2 particles has been investigated via a surfactant-free synthetic nonhydrothermal method. Titanium isopropoxide and toluene were used as the starting materials. At a low temperature of 250 °C for 6 h, the reaction mixture turned in to a white precipitate (TiO 2 ) as a result of the thermal decomposition of metal alkoxide. The obtained product was found to crystallize purely in the anatase phase with well defined morphology. The powder XRD study confirms that the average size of the particle is close to ~15 nm. The TEM analysis indicates the sizes of the primary and secondary particles in the range between 8-10 nm and 15-20 nm respectively. The quantum size confinement of the crystallites is evident from the blue shift of the absorption edge in the UV-Visible absorption spectrum. The luminescence property of the TiO 2 nanoparticles studied by the emission spectrum confirms the presence of defect levels caused by the oxygen vacancies.

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Section: Introductionmentioning

confidence: 99%

Synthesis, structural and optical properties of well dispersed anatase TiO₂ nanoparticles by non‐hydrothermal method

Christy¹,

Jothi²,

Melikechi

et al. 2009

Cryst. Res. Technol.

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“…In Fig. 5 one can see the normalized total transmittance versus laser peak intensity for the 5CB (triangles) and 5CB+AQ (circles), solid curves correspond to simulation results for the TPA process [18]:…”

Section: Resultsmentioning

confidence: 97%

Selfaction effects of femtosecond laser pulses in dye-doped 5CB liquid crystal

et al. 2006

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Photoinduced changes of transmittance and refractive index of 5CB nematic liquid crystal doped with anthraquinone dye under the action of femtosecond laser pulses are studied. The processes are considered in terms of strong interaction between liquid crystal matrix and dye molecules that is demonstrated by the example of fluorescence spectra.Spatial profile transformation of the femtosecond laser beam

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“…15 it was shown that PdO¯lms are suitable as storage media for high density information recording in static regime. Similarly to other transition metal oxides (TiO 2 , Fe 2 O 3 ), [16][17][18][19] it can be expected that PdO¯lms are suitable for dynamic information recording by short laser pulses, where nonlinear optical properties of thē lms become important and need to be studied. These studies need to be conducted for radiation with a wavelength close to the absorption edge where one should expect particularly high values of cubic nonlinear susceptibility.…”

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confidence: 99%

Large third-order optical nonlinearity in PdO thin films

Brodyn

Rudenko

Liakhovetskyi

et al. 2017

J. Nonlinear Optic. Phys. Mat.

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We report on a study of the absorption spectra and third-order nonlinear optical properties of crystalline PdO thin¯lms, grown by oxidation of thin palladium¯lms deposited on a substrate. The spectra reveal an absorption peak at ¼ 480 nm, which grows and narrows signi¯cantly as the temperature is lowered to T ¼ 77 K. This behavior suggests an exciton nature of the peak. According to the position of the long wavelength absorption edge in the spectra, the bandgap of the material is E g ¼ 2:4 eV. Utilizing the techniques of degenerate four-wave mixing and Z-scan, using a pulsed laser radiation with a wavelength ¼ 532 nm and a pulse duration of p ¼ 9 ns, we determined the real part of the third-order nonlinear susceptibility of Re ð3Þ ¼ À1:6 Â 10 À4 esu. Possible nature of this high refractive nonlinearity is discussed.Keywords: Palladium oxide; nonlinear optical properties; nanosecond pulsed laser; refractive nonlinearity.One of the most important problems of modern materials science is the search for and development of new functional optical materials with large optical nonlinearities, in particular third-order nonlinearities, for applications in optical information systems. Recent studies have shown that most promising in this respect are nanostructured systems based on noble metals, 1-3 where the third-order nonlinear optical response is enhanced by localized surface plasmons. 4 Another class of promising nonlinear optical materials comprise low-dimensional structures of metal oxides. For instance, the work of Panda et al., 5 report e±cient second harmonic generation of femtosecond 800 nm laser pulses using ZnO nanorods, which implies a high second-order optical nonlinearity of these systems. Methods of synthesizing such systems and determining their linear optical properties are presented in Ref. 6. Zhang et al., 7 report on an investigation of third-order optical nonlinearity of carbon nanotubes distributed into a polymer matrix; these systems demonstrate third-order nonlinear susceptibility on the order of 10 À12 esu. Also promising are thin¯lms of transition 3d metal oxides

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Giant nonlinear optical response of nanoporous anatase layers

Cited by 55 publications

References 15 publications

Synthesis, structural and optical properties of well dispersed anatase TiO₂ nanoparticles by non‐hydrothermal method

Synthesis, structural and optical properties of well dispersed anatase TiO₂ nanoparticles by non‐hydrothermal method

Selfaction effects of femtosecond laser pulses in dye-doped 5CB liquid crystal

Large third-order optical nonlinearity in PdO thin films

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Giant nonlinear optical response of nanoporous anatase layers

Cited by 55 publications

References 15 publications

Synthesis, structural and optical properties of well dispersed anatase TiO2 nanoparticles by non‐hydrothermal method

Synthesis, structural and optical properties of well dispersed anatase TiO2 nanoparticles by non‐hydrothermal method

Selfaction effects of femtosecond laser pulses in dye-doped 5CB liquid crystal

Large third-order optical nonlinearity in PdO thin films

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Synthesis, structural and optical properties of well dispersed anatase TiO₂ nanoparticles by non‐hydrothermal method

Synthesis, structural and optical properties of well dispersed anatase TiO₂ nanoparticles by non‐hydrothermal method