Abstract
Our research focused on exploring the second-order nonlinear susceptibility linked with optical rectification, second harmonic generation, and sum frequency generation in CdSe/ZnSe and CdSe/ZnS quantum dots, which are singly charged with electrons. We investigated these processes through intersublevel quadrupole transitions present in the conduction band. To calculate the confined energy levels in these dots, we used the effective-mass approximation and solved the three-dimensional Schrodinger equation. Our predictions indicate an enhanced nonlinear susceptibility that is approximately three orders of magnitude greater than the bulk CdSe susceptibility. We also observed that the second-order nonlinear processes are dependent on the size of the dot, the surrounding matrix, and the polarization state of the incident photon beam.
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Jain, K., Maikhuri, D. & Sahai, A. Quadrupole interaction induced optical rectification and second harmonic generation in CdSe quantum dots. Eur. Phys. J. Plus 139, 7 (2024). https://doi.org/10.1140/epjp/s13360-023-04794-5
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DOI: https://doi.org/10.1140/epjp/s13360-023-04794-5