Effect of the shape of quantum dots on the refractive index changes

Li, Keyin; Guo, Kangxian; Liang, Litao

doi:10.1016/j.physb.2016.08.054

Cited by 10 publications

(4 citation statements)

References 25 publications

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“…In this work, particularly, we have used two different methods to confirm our findings: (i) expansion of the wave function in a set of complete wave functions associated with a confined electron in a square rectangular box (with dimensions × ) with infinite confinement potential [18][19][20][21] and (ii) the finite elements method (FEM). In the first case, we have chosen to approach the solution of the in-plane problem in (2) by means of the following 2D expansion [18][19][20][21]:…”

Section: Theoretical Modelmentioning

confidence: 67%

Donor Impurity-Related Optical Absorption in GaAs Elliptic-Shaped Quantum Dots

Londoño

Restrepo

Ojeda

et al. 2017

Journal of Nanomaterials

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The conduction band and electron-donor impurity states in elliptic-shaped GaAs quantum dots under the effect of an externally applied electric field are calculated within the effective mass and adiabatic approximations using two different numerical approaches: a spectral scheme and the finite element method. The resulting energies and wave functions become the basic information needed to evaluate the interstate optical absorption in the system, which is reported as a function of the geometry, the electric field strength, and the temperature.

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Section: Theoretical Modelmentioning

confidence: 67%

Donor Impurity-Related Optical Absorption in GaAs Elliptic-Shaped Quantum Dots

Londoño

Restrepo

Ojeda

et al. 2017

Journal of Nanomaterials

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“…The second harmonic generation was first reported experimentally by [10]. Since then, there were a plethora of simulation studies on these properties including different structures [5,11,12], and different potentials such as parabolic [14], semi-parabolic [13]. To the best of our knowledge, the work done on the study of non-linear optical properties, particularly for finite square well potential was not sufficient.…”

Section: Introductionmentioning

confidence: 99%

A study of confined Stark effect, hydrostatic pressure and temperature on nonlinear optical properties in 1D GaxAl1-xAs/GaAs/GaxAl1-xAs quantum dots under a finite square well potential

Chaurasiya¹,

Dahiya²,

Sharma³

2023

Nanosystems: Phys. Chem. Math.

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In the present paper, investigations of nonlinear optical rectification, absorption coefficient and refractive index in a 1D Ga x Al 1−x As/GaAs/Ga x Al 1−x As quantum dots under a finite square well potential using simulation software such as COMSOL Multi-Physics and Matlab have been carried out in the presence of electric field, hydrostatic pressure and temperature. Results show that the resonant peaks of ORC (optical rectification coefficient) exhibit a blue shift under increasing of the electric field, while a red shift trailed by a blue shift is displayed under increasing of hydrostatic pressure and temperature. Similar trends take place for the refractive index as well as for the absorption coefficient under changing of the electric field, temperature and hydrostatic pressure. The attained theoretical results would pave a novel opportunity in designing, optimizing and applications of nonlinear opto-electronic devices by tuning the performance of the quantum dots and controlling some of their specific properties. KEYWORDS confined Stark effect, quantum dot, second harmonic generation, third harmonic generation FOR CITATION Chaurasiya R., Dahiya S., Sharma R. A study of confined Stark effect, hydrostatic pressure and temperature on nonlinear optical properties in 1D Ga x Al 1−x As/GaAs/Ga x Al 1−x As quantum dots under a finite square well potential.

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“…In low-dimensional semiconductor systems, particles are confined in one dimension-quantum wells, two dimensionsquantum wires, and three dimensions-quantum dots (QDs). It is this quantum confinement that makes low-dimensional semiconductor systems, especially QDs, offer many effects with considerable potential in the manufacture of new optical devices [1]; in electronic and optoelectronic applications [2,3]; for quantum-functional and memory devices [4,5]; and many other research fields such as quantum computing, photovoltaics, infrared photodetectors, medical imaging, and biosensors [6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Quantum Beat of Excitons in the Prolate Ellipsoidal Quantum Dots

Bao

Phuoc

Hien

et al. 2022

Journal of Nanomaterials

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In this paper, renormalized wavefunction method was applied to study quantum beats of excitons in the InGaAs/InAlAs prolate ellipsoidal quantum dots (QDs). The obtained results show that, without the pump laser, the exciton absorption intensity is just a smooth curve. In contrast, when the system is illuminated by a strong pump laser resonating with two exciton levels, the oscillation behavior of exciton absorption intensity, which is known as quantum beats of excitons, is observed. That result can be interpreted as an indirect consequence of the Pauli exclusion principle leading to a splitting of the electron levels, which forms two close exciton levels, and if two excitons are excited coherently, the interference of these two excitons will finally form a quantum beat. The study also shows that the geometry shape of the QDs has strong influence on the properties of quantum beats. Changing the period of quantum beats in particular or optical properties in general in QDs thus becomes more flexible through changing their geometry shapes. This is one interested advantage of the ellipsoidal QDs and is expected to increase their applicability more than the spherical QDs.

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Effect of the shape of quantum dots on the refractive index changes

Cited by 10 publications

References 25 publications

Donor Impurity-Related Optical Absorption in GaAs Elliptic-Shaped Quantum Dots

Donor Impurity-Related Optical Absorption in GaAs Elliptic-Shaped Quantum Dots

A study of confined Stark effect, hydrostatic pressure and temperature on nonlinear optical properties in 1D GaxAl1-xAs/GaAs/GaxAl1-xAs quantum dots under a finite square well potential

Quantum Beat of Excitons in the Prolate Ellipsoidal Quantum Dots

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