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<p>We investigate third-harmonic generation (THG) arising from intersublevel transitions in the conduction band of singly charged CdSe quantum dots (QDs) using the density matrix approach. We analyse the third-order nonlinear susceptibility responsible for the THG process by subjecting the quantum dot to three optical pump beams. Due to the strong electric dipole interactions between the pump fields and the confined electron in the quantum dot, the third-order nonlinear susceptibility in CdSe QDs is significantly enhanced compared to that in bulk materials. Results for THG in CdSe QDs embedded in ZnS, MgS, and MgSe matrices are presented. Both the size of the QD and the surrounding matrix strongly influence the third-order nonlinear susceptibility. Notably, QDs embedded in ZnS, a matrix with a high dielectric constant, show a comparatively higher susceptibility than other matrices.</p>

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THG enhancement in CdSe Quantum Dots: interplay of surrounding matrix and quantum confinement

  • 期刊论文

  • 发表日期：

    2026年2月14日

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  • Komal Jain,
  • Deepti Maikhuri,
  • Anshuman Sahai

摘要

We investigate third-harmonic generation (THG) arising from intersublevel transitions in the conduction band of singly charged CdSe quantum dots (QDs) using the density matrix approach. We analyse the third-order nonlinear susceptibility responsible for the THG process by subjecting the quantum dot to three optical pump beams. Due to the strong electric dipole interactions between the pump fields and the confined electron in the quantum dot, the third-order nonlinear susceptibility in CdSe QDs is significantly enhanced compared to that in bulk materials. Results for THG in CdSe QDs embedded in ZnS, MgS, and MgSe matrices are presented. Both the size of the QD and the surrounding matrix strongly influence the third-order nonlinear susceptibility. Notably, QDs embedded in ZnS, a matrix with a high dielectric constant, show a comparatively higher susceptibility than other matrices.