Theoretical study on nonlinear optical properties of CdS/ZnS spherical quantum dots

Hasanirokh, Kobra; Asgari, Asghar; Rokhi, Masoud Mahdizadeh

doi:10.1016/j.ijleo.2019.03.053

Cited by 24 publications

(11 citation statements)

References 11 publications

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“…Where 𝑛 is the volume density of carriers in the system, 𝑀𝑖𝑗 = ⟨𝜓𝑖 |𝑧|𝜓𝑗 ⟩ is the DTMEs, 𝐸 𝑗𝑖 = 𝐸 𝑗 − 𝐸 𝑖 is the transition energy between the two quantum states, ℏ𝜔 denotes the incident photon energy, 𝐸 ̃ is the amplitude of the electromagnetic field, and Г = 1/𝜏 is the relaxation rate [44][45][46].…”

Section: Optical Susceptibility Absorption and Refractive Index Changesmentioning

confidence: 99%

Tuning Absorption coefficient and refractive index changes in GaAs quantum ring Under Combined Effects of Temperature, Pressure, Rashba and Dresselhaus spin-orbit couplings

Hasanirokh

2023

Preprint

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In the present work, we have explored how the pressure, temperature and size of a GaAs quantum ring in the presence of Rashba and Dresselhaus spin–orbit couplings (SOC) can affect the energy states, dipole transition matrix elements (DTMEs), optical absorption coefficients (OACs) and refractive index changes (RICs). In addition to the theoretical beauty of this important and exciting area of research, it represents the attractive potential applications in the growth of optoelectronics devices. The results have indicated that the ground state energy values rise with pressure and Dresselhaus coupling. Meanwhile, increasing the temperature and Rashba coupling as well as the ring’s size leads to a decrement of energy levels. Taking the transition from the ground state to the first excited state, we have found that the temperature, pressure, inner and outer radius decrease DTMEs because of a drop in wave functions overlap. Therefore, the presence of SOCs, pressure, temperature and dimensions of the quantum ring dominate the electronic behavior and consequently control the absorption as well as the refractive index of the nano structure. A significant enhancement of the OACs and RICs curves is witnessed when the pressure, ring geometric, and Rashba strength are enlarged, but Increasing Dresselhaus coefficient decreases OACs and RICs. These parameters are responsible for blue shifts in the optical absorption. These results can be suitable in the construction of spin-based devices.

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Section: Optical Susceptibility Absorption and Refractive Index Changesmentioning

confidence: 99%

Tuning Absorption coefficient and refractive index changes in GaAs quantum ring Under Combined Effects of Temperature, Pressure, Rashba and Dresselhaus spin-orbit couplings

Hasanirokh

2023

Preprint

Self Cite

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“…Expressions of RICs can be obtained by density matrix approximation. Analytical expressions of linear and third order nonlinear sensitivities for a two-level quantum system are given in the forms (1)…”

Section: Linear Nonlinear and Total Rics Of The Systemmentioning

confidence: 99%

“…Proper adjustment of the physical properties of QDs is advantageous because of their potential applications in the development of semiconductor optoelectronic devices. For this reason, some optical properties of semiconductor QDs such as dipole transition [1,2], oscillator strength [3,4], photoionization cross-sections [5], optical absorption coefficients (OACs) [6,7] and refractive index changes (RICs) [3,8] have attracted the attention of researchers in experimental and theoretical studies in recent years.…”

Section: Introductionmentioning

confidence: 99%

Effect of size modulation and donor position on intersubbands refractive index changes of a donor within a spherical core/shell/shell semiconductor quantum dot

Al¹

2021

Cumhuriyet Science Journal

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In the current study, linear, nonlinear and total relative refractive index changes of a single shallow hydrogenic donor atom confined in semiconductor core/shell/shell quantum dot heterostructure are investigated in detail by compact density matrix formalism. For this purpose, the energy eigenvalues and the corresponding wave functions are calculated by diagonalization method in the effective mass approximation. Then, intersubband 1 → 1 and 1 → 1 donor transition energies are calculated. In the study, the effects of core/shell sizes, donor position and depth of confinement potential are analyzed. The numerical results show that the linear and nonlinear refractive index changes undergo significant changes.

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“…for nonlinear OAC. Thus, the maximum values of linear and nonlinear OACs are given in the forms α (1) max (ω) =…”

Section: B Optical Absorption Coefficientsmentioning

confidence: 99%

Effect of magnetic field, size and donor position on the absorption coefficients related a donor within the core/shell/shell quantum dot

2021

Preprint

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In this study, linear, nonlinear and total optical absorption coefficients related a single shallow donor atom confined in semiconductor core/shell/shell quantum dot heterostructure are researched in detail within the compact density matrix formalism approximation. For this purpose, firstly, the energies and the wavefunctions are computed by the diagonalization method in the effective mass approach. Moreover, the effects of size modulation, donor position and magnetic field are analyzed. The numerical results indicate that the linear and nonlinear parts of the absorption coefficients related with intersubband 1s-1p and 1p-1d donor transitions undergo significant changes.

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Theoretical study on nonlinear optical properties of CdS/ZnS spherical quantum dots

Cited by 24 publications

References 11 publications

Tuning Absorption coefficient and refractive index changes in GaAs quantum ring Under Combined Effects of Temperature, Pressure, Rashba and Dresselhaus spin-orbit couplings

Tuning Absorption coefficient and refractive index changes in GaAs quantum ring Under Combined Effects of Temperature, Pressure, Rashba and Dresselhaus spin-orbit couplings

Effect of size modulation and donor position on intersubbands refractive index changes of a donor within a spherical core/shell/shell semiconductor quantum dot

Effect of magnetic field, size and donor position on the absorption coefficients related a donor within the core/shell/shell quantum dot

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