Exploring the nonlinear optical properties of impurity doped quantum dots in the light of noise-binding energy interplay

Arif, Sk. Md.; Bera, Aindrila; Ghosh, Manas

doi:10.1016/j.rinp.2019.02.075

Cited by 8 publications

(1 citation statement)

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“…Other nonlinear optical effects that have been extensively studied in isolated semiconductor quantum dots, see, e.g., Refs. [33][34][35][36][37][38][39][40][41][42][43], are the optical absorption coefficient (OAC) and the refractive index change (RIC). Recently, the two last-mentioned phenomena have been analyzed in semiconductor nanostructures, such as quantum dots, semiconductor nanoshells, and quantum wires coupled with a spherical metallic nanoparticle [44][45][46].…”

Section: Introductionmentioning

confidence: 99%

Optical Absorption Coefficient and Refractive-Index Change in a Coupled Quantum Dot-Metallic Nanoparticle Structure

Evangelou

2023

Photonics

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In the present work, we investigate the problem of the optical absorption coefficient (OAC) and refractive-index change (RIC) in a semiconductor quantum dot placed in the vicinity of a spherical metallic nanoparticle. We derive the total OAC and RIC from the density-matrix equations through different approaches, one without approximations and the other keeping only linear and third-order nonlinear terms. The derived formulae are then applied in a specific hybrid nanostructure to calculate the OAC and RIC. The results obtained from the derived formulae are used to compare cases of various interparticle distance values and applied light intensities and find that, although for specific distances and intensities the formulae may give similar results, in general, they give different results. Moreover, it becomes clear that the distance between the quantum dot and the metallic nanoparticle, in combination with the polarisation of the light field, plays a significant role in the OAC and RIC of the quantum dot. Expressly, conditional on the polarisation of the applied electric field, the OAC and RIC of the quantum dot can be either enhanced or suppressed close to the metallic nanoparticle compared to their values in the absence of the metallic nanoparticle.

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