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<p>This study investigates the third-order nonlinear optical (NLO) properties of Zinc-doped Cadmium Sulfide (Zn-doped CdS) nanoparticles at varying doping concentrations (10%, 20%, and 30%). The research highlights the significant enhancement in NLO responses, including the optical Kerr effect, two-photon absorption (TPA), and third-harmonic generation (THG), attributed to Zn doping. Structural and optical characterizations using FTIR, XRD, SEM, TEM, and UV-Vis spectroscopy confirmed successful Zn incorporation into the CdS lattice, leading to modified bandgap energies and increased defect-mediated charge transfer. Z-scan measurements revealed a strong correlation between doping concentration and NLO performance, with 30% Zn-doped CdS exhibiting the highest nonlinear refractive index (n₂), absorption coefficient (β), and third-order susceptibility (χ⁽³⁾). These findings underscore the potential of Zn-doped CdS nanomaterials for advanced photonic applications such as optical switching, limiting, and ultrafast signal processing.</p>

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Tunable nonlinear optical response in Zn-doped cds nonmaterial: a route to next-generation photonic devices

  • 期刊论文

  • 发表日期：

    2025年9月2日

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  • C. Selvakumar,
  • V. T. Geetha,
  • A. Jayanthi,
  • C. Baby Gowri

摘要

This study investigates the third-order nonlinear optical (NLO) properties of Zinc-doped Cadmium Sulfide (Zn-doped CdS) nanoparticles at varying doping concentrations (10%, 20%, and 30%). The research highlights the significant enhancement in NLO responses, including the optical Kerr effect, two-photon absorption (TPA), and third-harmonic generation (THG), attributed to Zn doping. Structural and optical characterizations using FTIR, XRD, SEM, TEM, and UV-Vis spectroscopy confirmed successful Zn incorporation into the CdS lattice, leading to modified bandgap energies and increased defect-mediated charge transfer. Z-scan measurements revealed a strong correlation between doping concentration and NLO performance, with 30% Zn-doped CdS exhibiting the highest nonlinear refractive index (n₂), absorption coefficient (β), and third-order susceptibility (χ⁽³⁾). These findings underscore the potential of Zn-doped CdS nanomaterials for advanced photonic applications such as optical switching, limiting, and ultrafast signal processing.