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Quadratic and cubic nonlinear optical responses of ZnO harmonic nanoparticles and KDP single crystals with incorporated metal oxides nanoparticles

Abstract : This work focuses on the experimental characterization of the linear and nonlin-ear optical properties of harmonic nanoparticles - a new class of biological markers - and of composites based on KDP single crystals with incorporated metal oxide nanoparticles. We have developed several experimental setups, such as light scattering indicatrices technique, laser beam self-action analysis, the third harmonic generation efficiency (THG) measurements, and multiphoton microscopy with femtosecond laser excitation in the 710 - 1300 nm spectral range. The third order susceptibility measurements were performed by analyzing the THG at the interface of a cuvette filled with ZnO colloidal suspensions, showing a susceptibility value close to the reference value of the bulk crystal. In addition, the optical properties of these nanoparticles were studied with multiphoton mi-croscopy. The emission spectra of the nanoparticles show the second harmonic generation (SHG), the THG and photoluminescence signals. The spectral re-sponse has been correlated with the structure of defects in bulk ZnO crystals. In addition, we studied the influence of the incorporation of metal oxide nanopar-ticles into KDP crystals. It has been shown that these nanoparticles can increase the SHG efficiency compared to nominally pure KDP crystal. A set of optical measurements was carried out on these composite crystals, demonstrating the relationship between the third order nonlinear optical effects and the observed SHG efficiency enhancement.
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Submitted on : Thursday, December 12, 2019 - 10:44:31 AM
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Volodymyr Multian. Quadratic and cubic nonlinear optical responses of ZnO harmonic nanoparticles and KDP single crystals with incorporated metal oxides nanoparticles. Optics / Photonic. Université Savoie Mont Blanc, 2019. English. ⟨tel-02406550⟩

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