Browsing by Author "Buchal C."

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    Application of ion implantation for synthesis of copper nanoparticles in a zinc oxide matrix for obtaining new nonlinear optical materials
    (2004) Stepanov A.L.; Khaibullin R.I.; Can N.; Ganeev R.A.; Ryasnyansky A.I.; Buchal C.; Uysal S.
    We have obtained a layered composite material by implantation of single crystal zinc oxide (ZnO) substrates with 160-keV Cu+ ions to a dose of 1016 or 1017 cm-2. The composite was studied by linear optical absorption spectroscopy; the nonlinear optical characteristics were determined by means of Z-scanning at a laser radiation wavelength of 532 nm. The appearance of the optical plasmon resonance bands in the spectra indicated that ion implantation to the higher dose provides for the formation of copper nanoparticles in a sub-surface layer of ZnO. The new nonlinear optical material comprising metal nanoparticles in a ZnO matrix exhibits the phenomenon of self-defocusing and possesses a high nonlinear absorption coefficient (β = 2.07 × 10-3 cm/W). © 2004 MAIK "Nauka/Interperiodica".
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    Nonlinear optical absorption of ZnO doped with copper nanoparticles in the picosecond and nanosecond pulse laser field
    (OSA - The Optical Society, 2005) Ryasnyansky A.; Palpant B.; Debrus S.; Ganeev R.; Stepanov A.; Can N.; Buchal C.; Uysal S.
    The nonlinear absorption of nanocomposite layers based on ZnO implanted with Cu+ ions with an energy of 160 keV in implantation doses of 1016 and 1017 ions/cm2 was investigated. The values of the nonlinear absorption coefficient were measured by the Z-scan method at a wavelength of 532 nm by use of nanosecond and picosecond laser pulses. Possible optical applications of these materials are discussed. © 2005 Optical Society of America.