Linear and Nonlinear Optical Absorption of CdSe/CdS Core/Shell Quantum Dots in the Presence of Donor Impurity

Mantashian, Grigor A.; Zaqaryan, Nare A.; Mantashyan, Paytsar; Sarkisyan, H. A.; Baskoutas, Sotirios; Hayrapetyan, D. B.

doi:10.3390/atoms9040075

Cited by 19 publications

(3 citation statements)

References 44 publications

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“…Regarding infrared photodetection obtained from confinement space, InAs nano-disks in a QW cause a calculable optical absorption [6]. As an absorber modeling on the light wave, intensitydependent absorption has been introduced within iterative density matrix form [7], so several studies where linear and nonlinear optical absorption have been reported [8][9][10][11]. Since third-order nonlinear phenomena depend on optical intensity, saturable absorption has also been accomplished [12].…”

Section: Introductionmentioning

confidence: 99%

Infrared relative dielectric permittivity and refractive index on the spherical CdSe/ZnS heteronanocrystals with self-consistent field

Ortakaya,

Duque

2024

Phys. Scr.

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We deal with allowed-subband quantum states of two-electron in a semiconductor spherical core/shell quantum dot. Within framework of the infrared transitions, solving the Schrödinger-Poisson equation for many body interactions on the conduction-subbands, we obtain energy shifts in the absorption peaks of dielectric function and refractive index. The energy eigenvalues of the CdSe/ZnS nanocrystal have been computed as a function of the layer thicknesses via self-consistent field. The transitions related to $D^{-}$ and $D^0$ states, have been plotted considering linear dielectric permittivity. Refractive index and absorption coefficient under 3.0 nm radius have been also presented as a function of infrared photon energies.

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Section: Introductionmentioning

confidence: 99%

Infrared relative dielectric permittivity and refractive index on the spherical CdSe/ZnS heteronanocrystals with self-consistent field

Ortakaya,

Duque

2024

Phys. Scr.

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“…Another potential model is the Poeschel Teller potential. In the following articles, the electronic states in the presence of an impurity in the center, and exciton states in CdSe/CdS core/shell QDs were studied as well as Raman spectra due to excitons, spectra of interband and subband absorption, as well as photoluminescence 45,46 .…”

Section: Introductionmentioning

confidence: 99%

The contribution of edge number on the optical properties in ZnO pyramidal quantum dots

Mantashyan

2023

Quantum Optics and Photon Counting 2023

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Considerable advances in the growth process of quantum dots with non-trivial geometries have been obtained. These advances lead to countless applications in quantum optics, quantum information, and biophysics. However, the theoretical investigation of these objects is complex and analytically impossible in most cases. The investigation of pyramidal or conical quantum dots with a comparable height-to-base ratio is one of those problems. That is why the numerical finite element method in the framework of the envelope function approximation has been used to obtain the eigenvalues and eigenfunctions for ZnO pyramidal and conical quantum dots. The mesh domains required for the finite element method calculation were pyramidal domains with bases ranging from an equilateral triangle to an equilateral decagon. Cones were used for the approximation of the mesh objects for pyramidal quantum dots with a larger number of edges. Different head radius to height ratios (½, 1, 2, 3, 4) were considered. The optical transition energies were shown to decrease with the increase in the number of faces. The optical transition strengths were shown to exhibit the opposite behavior. The interband absorption curves generally exhibit a redshift with the increase in the number of edges.

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“…In consequence, studies on impurity doped low‐dimensional semiconductor nanostructures have been widely explored [ 2–16 ] with special thrust on their NLO properties. [ 17–41 ]…”

Section: Introductionmentioning

confidence: 99%

Role of Spatial Impurity Spread on the Transition Dynamics of Doped GaAs Quantum Dot in Presence of Noise

Datta,

Bhakti,

Ghosh

2023

Physica Status Solidi (b)

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Present enquiry thoroughly explores the time‐average population transfer rate (TAPTR) of impurity doped GaAs quantum dot (QD) pursuing the change in the spatial impurity spread (SIS). The said excitation rate has been studied under the supervision of Gaussian white noise (GWN). The promotion of the ground state electronic density takes place due to different types of time‐changing fluctuations viz. simple sinusoidal field, time‐dependent confinement potential and time‐dependent magnetic field. GWN couples with the QD by additive and multiplicative modes. The work examines the joint influence of SIS, GWN and its pathway of inclusion and the nature of the time‐dependent perturbations on the attributes of the TAPTR. The TAPTR curves are composed of steadfast rise, steadfast diminish, maximization (relevant to generation of large nonlinear optical properties), minimization and saturation (suggesting dynamic freezing). The findings elucidate the means of fine‐tuning the TAPTR among the doped GaAs QD eigenstates in presence of noise, when the SIS undergoes a gradual change.This article is protected by copyright. All rights reserved.

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Linear and Nonlinear Optical Absorption of CdSe/CdS Core/Shell Quantum Dots in the Presence of Donor Impurity

Cited by 19 publications

References 44 publications

Infrared relative dielectric permittivity and refractive index on the spherical CdSe/ZnS heteronanocrystals with self-consistent field

Infrared relative dielectric permittivity and refractive index on the spherical CdSe/ZnS heteronanocrystals with self-consistent field

The contribution of edge number on the optical properties in ZnO pyramidal quantum dots

Role of Spatial Impurity Spread on the Transition Dynamics of Doped GaAs Quantum Dot in Presence of Noise

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