Laser radiation effect on the optical properties of a spherical quantum dot confined in a cylindrical nanowire

Safarpour, Gh.; Zamani, Ali; Izadi, Mohammad; Ganjipour, H.

doi:10.1016/j.jlumin.2013.11.053

Cited by 38 publications

(9 citation statements)

References 38 publications

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“…The response of elliptically polarized laser field on TRICs and TACs of quantum dot with spherical harmonic potential was researched and elucidated the role of polarization on subband transitions and optical specifications [21]. The laser radiation effect on TRICs and TACs of a spherical GaAs quantum dot placed at center of a cylindrical nanowire was viewed by using finite difference method and compact‐density‐matrix approach [22]. The considerable function of AB flux fields on optical properties is also in question.…”

Section: Introductionmentioning

confidence: 99%

Optical response of plasma processed quantum dot under the external fields

Kılıç

Bahar

2020

Int J of Quantum Chemistry

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We investigate theoretically the total refractive index changes (TRICs) and the total absorption coefficients (TACs) of two‐electron Gaussian quantum dot (TEGQD) including Gaussian potential confinement generated by GaAs/GaAlAs heterostructure, embedded in Debye and quantum plasma environments modeled by the more general exponential cosine screened Coulomb (MGECSC) potential, under the influence of the external electric and magnetic field. The wave equation is solved within the effective mass approach framework by using Runge–Kutta–Fehlberg method in order to obtain the subband spectra and the electronic wave functions of TEGQD. Nonlinear optical response of TEGQD is obtained through the compact‐density‐matrix formalism within the iterative method. The effects of both Debye and quantum plasma environments in the strong and weak regimes of the external fields are considered and compared throughout the study. The potents of the external electric field, the external magnetic field, the quantum dot width, the barrier height, and the plasma screening on TRICs and TACs resonant frequencies and amplitudes are analyzed. In addition to these analyses, the alternatives to each parameter effects of the model are also elucidated. TRICs and TACs analyze are carried out in a plasma‐free environment, and thus the function of environments with plasma compared to that without plasma is better explained. Thanks to all these reviews, it is elucidated how to and at what ranges perform in terms of the incident photon energy of TEGQD's optimum for TRICs and TACs characters by using plasma, and in which cases it will be an alternative to the external field and geometrical encompassing.

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Section: Introductionmentioning

confidence: 99%

Optical response of plasma processed quantum dot under the external fields

Kılıç

Bahar

2020

Int J of Quantum Chemistry

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“…After finding the energy levels and wave functions, the OACs and RICs involving optical transitions between any two impurity states can be easily calculated by using compact density‐matrix approach. In this way, the total OAC related with intradonor transition i → j is given by refs

α true(ω, I true) = α^{(1)} (ω) + α^{true(3 true)} true(ω, I true)

where

α^{(1)} true(ω true) = ω \sqrt{\frac{μ_{0}}{ε_{R}}} \frac{σ_{v} {| M_{j i} |}^{2} ℏ Γ_{j i}}{Λ^{2} + {(ℏ Γ_{j i})}^{2}}

and

α^{(3)} true(ω, I true) = - ω \sqrt{\frac{μ_{0}}{ε_{R}}} true(\frac{I}{2 ε_{0} n_{r} c} true) \frac{σ_{v} {| M_{j i} |}^{2} ℏ Γ_{j i}}{{[Λ^{2} + {(ℏ Γ_{j i})}^{2}]}^{2}} \times true[4 {| M_{j i} |}^{2} - \frac{{\bar{M}}_{j i}^{2} F_{j i}}{Δ E_{j i}^{2} + (ℏ}

…”

Section: Theoretical Approachmentioning

confidence: 99%

“…Most importantly, the effects of the ITLFs on shallow‐impurity states can be detected, for instance, by measuring the distortion of the binding energy and the internal transition energy associated with impurity states, which shows up as modifications of nonlinear optical properties of shallow impurities in semiconductors and related nanostructures when irradiated by ITLFs . In this respect, recently particular interest has been paid to the nonlinear optical properties associated with shallow impurities in laser‐driven systems because of the potential applications in electronic and optoelectronic devices . It has been reveled that in laser‐driven systems, the nonlinear optical properties, such as optical absorption coefficients (OACs) and refractive index changes (RICs) for intradonor optical transitions, can be intensely tuned not only by the quantum confinement and the geometric parameters but also by the ITLFs via laser‐dressed potential.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Intense Terahertz Laser and Magnetic Fields on Optical Properties of a Shallow Impurity in Semiconductors in the Faraday Configuration

Wei

Wang

et al. 2018

Physica Status Solidi (b)

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The influence of intense terahertz laser and magnetic fields on the total optical absorption coefficient for the transitions between shallow‐impurity states 1s and 2p± in semiconductors within the Faraday configuration is studied by using the compact density‐matrix approach, where the energy levels and wave functions of shallow‐impurity states are obtained by using a combination of time‐dependent nonperturbative approach and variational method. We find that the transition energy of shallow‐impurity states and the dipole matrix element can be not only increased but also decreased by varying the external fields via laser‐dressed Coulomb potential. In this way, the saturable absorption and the resonant peak position and magnitude of the total optical absorption coefficient can be effectively tuned with an appropriate choice of the external fields. Moreover, an appreciable effect of cyclotron motion on the total optical absorption coefficient is observed. This gives new degree of freedom in various device applications based on the intradonor transition of electrons.

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“…Various factors af-fecting the optical properties like the electric field, magnetic field, impurity factor, different confining potential, temperature, and hydrostatic pressure etc. [16][17][18][19] have been studied extensively.…”

Section: Introductionmentioning

confidence: 99%

Hydrogenic impurity effect on optical properties of Wannier-Mott exciton confined in a spherical quantum dot with Kratzer potential under magnetic field

Varsha

Giri²,

Arora³

et al. 2022

Rev. Mex. Fís.

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Confinement effects of Kratzer potential on a Wannier-Mott Exciton(W-M) are studied in a spherical quantum dot(QD) in the presence of a static magnetic field. Time independent Schr$\ddot{o}$dinger equation is solved numerically to obtain the energy states. The excitonic transitions so realized have been used to explore the non-linear optical properties that are important for optical characterization of materials such as the optical absorption coefficients (ACs) and refractive index changes (RICs). Impact of magnetic field, strength of the laser field and transition parameters using familiar compact density matrix approach are also analyzed. It has been observed that optical properties get radically modified under confinement effects. Also, the shift of degeneracy of different excitonic energy levels with the magnetic field in confinement potential has been reported for the first time for W-M exciton in the spherical quantum dot, the study that may have crucial input to the literature and myriad of practical implications.

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Laser radiation effect on the optical properties of a spherical quantum dot confined in a cylindrical nanowire

Cited by 38 publications

References 38 publications

Optical response of plasma processed quantum dot under the external fields

Optical response of plasma processed quantum dot under the external fields

The Effects of Intense Terahertz Laser and Magnetic Fields on Optical Properties of a Shallow Impurity in Semiconductors in the Faraday Configuration

Hydrogenic impurity effect on optical properties of Wannier-Mott exciton confined in a spherical quantum dot with Kratzer potential under magnetic field

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