Quadratic electro-optic effects and electro-absorption process in multilayer nanoshells

Bahari, Ali; Moghadam, Fereshteh Rahimi

doi:10.1088/0031-8949/83/05/055703

Cited by 5 publications

(3 citation statements)

References 27 publications

(37 reference statements)

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“…When the thickness of the inner or outer shell increase, energy distances between electronic states become smaller. Therefore, the size of the inner or the outer shell grows, the energy distance shrinks, and the dipole matrix element m [31,45] and susceptibility is plotted as a function of pump photon energy ÿω (eV) for various d 2 while R 1 =d 1 =d 3 =1 nm in the case E<V c . Both the magnitude of the peak and its position depend on the middle shell thickness.…”

Section: Resultsmentioning

confidence: 99%

Theoretical investigation on the third order nonlinear optical susceptibility in CdS/ZnS/CdS/ZnS core/shell/well/shell quantum dots for optoelectronic applications

et al. 2019

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In this paper, a detailed study on the third order nonlinear optical susceptibility for quadratic electro-optic effects for CdS/ZnS/CdS/ZnS core/shell/well/shell spherical quantum dots is realized. Electron energies and corresponding functions are investigated under the frame work of the effective-mass approximation. Then, the third order nonlinear susceptibility is determined using the density matrix method. The dot size effect on this susceptibility is also examined. Numerical calculations confirm that both position and intensity of the peaks can be controlled by varying shell thickness. In addition, by increasing the width of inner or outer shell, the peaks of susceptibility is redshifted and the intensities are increased. Moreover, the ‘inverted’ structure, ZnS/CdS/ZnS/CdS has shown better nonlinear optical properties.

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Section: Resultsmentioning

confidence: 99%

Theoretical investigation on the third order nonlinear optical susceptibility in CdS/ZnS/CdS/ZnS core/shell/well/shell quantum dots for optoelectronic applications

et al. 2019

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“…Over the years, much consideration has been given to the third order optical nonlinearity in the QD nanostructures. Various studies have investigated the third order nonlinear optical susceptibility (TONOS) using experimental methods [18,19] or theoretical approaches [20][21][22][23][24][25][26]. The results revealed that, the TONOS is largely controlled by the size and shape of the nanodot, the incident photon energy, the relaxation time and the molar concentration of the materials.…”

Section: Introductionmentioning

confidence: 99%

Effects of the magnetic field and the off-center displacement on the third-order nonlinear optical susceptibility of inverted core/shell spherical one-electron quantum dots

Negoukoumé Abdoulaï,

Melingui Melono,

Motapon

2023

Phys. Scr.

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The third order nonlinear optical susceptibility (TONOS) of an inverted ZnS/CdSe core–shell spherical quantum dot embedded in SiO 2-matrix with or without impurity, and subjected to an external magnetic field is investigated. Within the framework of effective mass approximation and using B-splines basis functions, the energy levels, the dipole matrix elements and the TONOS are computed. The dielectric mismatch in the interface dots as well as the effective mass dependence on the core and shell regions are taken into account. It is revealed that, simultaneously the shell size, magnetic field and off-center displacement have a noticeable effect on the positions and the heights of the peaks of the TONOS. Moreover, we have shown that, due to the magnetic field and the off-center displacement effects, the TONOS takes different profiles associated with the polarization direction (parallel and perpendicular). In the perpendicular polarization, two peaks of the nonlinear optical properties appear for each off-center displacement value corresponding to the two transversal allowed transitions. The shift towards higher energies of the peak position and the reduction of the intensity of the peak when the magnetic field increases are recorded in the transversal transition case. Furthermore, in the longitudinal transition, as increasing the magnetic field strength, the intensity of the peak of the TONOS grows and the position of the peak is shifted towards lower frequencies. The dielectric constant, effective mass and conduction band offset of the materials that constitute the core and shell are equally found to modify significantly the main features of the susceptibility.

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“…As for theoretical works, the magnetic and electric field effects on the binding energy of a shallow donor confined to move in spherical QDQW is studied in Rahmani et al (2009), and quadratic electro-optic effects and electroabsorption process in multilayer nanoshells is discussed in Bahari and Moghadam (2011). In the previous works of the author with co-authors the influence of weak external uniform (Harutyunyan 2003(Harutyunyan , 2007Harutyunyan et al 2004a) and radial (Harutyunyan 2002;Harutyunyan et al 2004b) electrostatic fields on the electronic and optical properties of QDQWs are examined theoretically.…”

Section: Introductionmentioning

confidence: 99%

Nanospherical heterolayer in strong electrostatic field

Harutyunyan

2012

Appl Nanosci

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The influence of a strong homogeneous electric field on the states of charge carriers in the structure of quantum dot-quantum well (QDQW) is studied theoretically. It is shown that a strong external field changes radically the character of carrier motion in the structure and leads to an additional field-localization of the particle along the polar angle variable. An explicit form of the wave functions and energy spectrum of single-particle states in the structure in the presence of an external field is obtained. The possibilities of experimental and operational applications of the theoretical results obtained for the study of core/layer/shell structures as well as of hollow spheres are also shown.

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Quadratic electro-optic effects and electro-absorption process in multilayer nanoshells

Abstract: In this corrigendum, the authors would like to report typographic errors in the first name of the second author and in equation 7.The first name of the second author should have been written Fereshteh instead of Fatemeh.In equation 7 the parameter k nl,2 should have been written

Cited by 5 publications

References 27 publications

Theoretical investigation on the third order nonlinear optical susceptibility in CdS/ZnS/CdS/ZnS core/shell/well/shell quantum dots for optoelectronic applications

Theoretical investigation on the third order nonlinear optical susceptibility in CdS/ZnS/CdS/ZnS core/shell/well/shell quantum dots for optoelectronic applications

Effects of the magnetic field and the off-center displacement on the third-order nonlinear optical susceptibility of inverted core/shell spherical one-electron quantum dots

Nanospherical heterolayer in strong electrostatic field

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