Third order optical nonlinearities characteristics of Disperse Red1 organic dye molecules inside of polymeric nanocapsules

J Mater Sci: Mater Electron

Ostad

et al. 2021

Hollow nanostructures have attracted attention because of their unique physiochemical properties and broad potential applications in electronics, optics and photonics. In this study, a facile hydrothermal approach was developed to fabricate hollow ZnO microspheres via self-assembled rod-like nanostructures. The morphology-controlled synthesis was conducted by altering hydrothermal treatment temperature (150, 200 and 250 °C) in solutions containing zinc acetate dihydrate precursor and glycerol as the stabilizing agent. The morphological observations indicated that hydrothermally grown ZnO architectures could be reasonably adjusted by modulating hydrothermal reaction temperature. Possible growth routes are proposed to elucidate the formation process of ZnO microspheres with the rod-like nanostructures. Morphology-dependent absorbance and emission along with red-shifts with improved crystalline qualities were observed with increasing hydrothermal growth temperature. Kerr-type nonlinear optical characteristics examined using single-beam Z-scan technique in the near infrared spectral range under nanosecond Nd-YVO4 laser pulses showed positive values of nonlinear refraction providing an evidence of self-focusing behaviors at the excitation wavelength of 1064 nm in all the samples studied. The highest Kerr-type nonlinear susceptibility was estimated to be 2.31 × 10–6 esu for hollow ZnO microspheres grown at 250 °C, suggesting synergistic effects of surface morphologies on optical nonlinearities.

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Section: Nonlinear Optical Characterizationmentioning

confidence: 99%

Hollow ZnO microspheres self-assembled from rod-like nanostructures: morphology-dependent linear and Kerr-type nonlinear optical properties

J Mater Sci: Mater Electron

Ostad

et al. 2021

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“…In the absence of nonlinear absorption, the third-order nonlinear refractive index ( n 2 ) can be approximated by the following theoretical relation [23]:…”

Section: Nonlinear Optical Measurementsmentioning

confidence: 99%

Facile synthesis of ZnS–Ag2S core–shell nanospheres with enhanced nonlinear refraction

Kiani

J Mater Sci: Mater Electron

et al. 2019

ZnS-Ag 2 S core-shell nano/hetero-junctions have been synthesized by a two-step co-precipitation technique, in which thin layers of Ag 2 S have been successfully coated on the surface of ZnS nanospheres. Structural studies and elemental analysis have been performed using X-ray diffraction, Fourier transfer infrared spectroscopy, field emission scanning electron microscopy, energy dispersive spectroscopy, and high-resolution transmission electron microscopy. UV-Vis diffuse reflectance spectroscopy and photoluminescence spectroscopy have been employed to investigate linear optical characteristics. Nanosecond laser pulsed-based single-beam Z-scan analysis has been used to examine the magnitude and the sign of the third-order nonlinear refractive indices. Samples show negative values of nonlinear refractive indices indicating self-defocusing optical nonlinearity under 1064 nm excitation. The results have shown that the third-order nonlinear refractive index in ZnS nanospheres can reach the magnitude of 61.0 × 10 −12 m 2 ∕W by encapsulating such a nanostructure within nanometer shells of Ag 2 S. The enhanced nonlinearity for ZnS-Ag 2 S core-shells has been found to be 9 times higher than sole ZnS nanoparticles, which was estimated to be about 6.4 × 10 −12 m 2 ∕W.

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Synthesis, characterization and investigation of linear and infra-red nonlinear optical properties of TiO2/ZnO core/shell nanospheres

2020

Appl. Phys. B