Magnetic-field and geometric structure effects on the linear and nonlinear optical properties of multilayered spherical quantum dots

This study investigates the optical properties of multilayered spherical quantum dots (MSQDs) with a focus on the influence of layer dimensions and external magnetic field (B-field). Utilizing the finite element method, we systematically analyze the effects on linear, third-order nonlinear, and total optical absorption coefficients, as well as refractive index variations. The results demonstrate a strong dependence of optical responses on the structural parameters of the quantum dots. Specifically, even minor variations in layer thickness lead to significant changes in both linear and third-order nonlinear absorption, highlighting the pronounced role of quantum confinement. Additionally, the presence of a magnetic field is shown to substantially modulate the optical characteristics, further emphasizing its critical role in tuning the optoelectronic behavior of MSQDs. This work provides valuable insights into the interplay between geometric structure and external fields, offering a foundation for the design of advanced nanophotonic devices with tailored optical functionalities.