Two-photon absorption induced photoluminescence from ZnS nanowires

Liu, Kuili; Li, Jitao; Liu, Quantao; Meng, Ming; Hu, Lingwei; Xu, Chunxiang

doi:10.1016/j.jallcom.2017.05.123

Cited by 6 publications

(1 citation statement)

References 19 publications

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“…ZnS shows optical nonlinearities like two-photon adsorption (TPA), second-harmonic generation (SHG), and THG that has elicited extensive interest in studying nonlinear optical behavior of ZnS nanostructures [7][8][9]. For example, two-photon absorption induced upon excitation with 650 nm light has been reported in ZnS nanowires prepared on Au-coated silicon substrates by a vapor phase transport (VPT) method [10]. ZnS nanostructures synthesized by laser ablation showed third-order optical susceptibility of 4.7 × 10 −12 esu under 532 nm excitation [11].…”

Section: Introductionmentioning

confidence: 99%

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

Haghighatzadeh

Kiani

Mazinani

et al. 2019

J Mater Sci: Mater Electron

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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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