Second-order nonlinear susceptibility in quantum dot structure under applied electric field

Abdullah, M.; Noori, Farah T. Mohammed; Al-Khursan, Amin H.

doi:10.1016/j.spmi.2015.01.041

Cited by 6 publications

(3 citation statements)

References 22 publications

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“…In this section,the linear, the third-order nonlinear and the total OACs and RICs of a hydrogenic donor impurity confined in a GaAs/AlGaAs core/shell spherical QD are calculated numerically. The parameter adopted in our calculation are as follows [11,22]: m * =0.067m 0 (m 0 is the free-electron mass), N = 5 × 10 16 cm −3 , n r = 3.2, T 12 = 0.14 ps, Γ 12 = 1/T 12 , I = 0.2 MW/cm 2 .…”

Section: Resultsmentioning

confidence: 99%

Donor-impurity-related optical absorption and refractive index changes in GaAs/AlGaAs core/shell spherical quantum dots

Zhang

Zhuang

Guo

et al. 2016

Superlattices and Microstructures

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In this study, the linear and nonlinear intersubband optical absorption coefficients (OACs) and refractive index changes (RICs) in GaAs/AlGaAs core/shell spherical quantum dots (QDs) are theoretically investigated within the framework of the compact-density-matrix approach and iterative method for both cases with and without on-center impurity. The energy eigenvalues and their corresponding eigenfunctions of the system are calculated by using the differential method. Our results show that the position and the magnitude of the resonant peaks of the nonlinear OACs and RICs depend strongly on the hydrogenic impurity and QDs radius. It was found that the total OACs indicates saturation at sufficiently high incident intensities. Also we found that the binding energy of the ground and excited states of the impurity depend on the QDs radius.

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Section: Resultsmentioning

confidence: 99%

Donor-impurity-related optical absorption and refractive index changes in GaAs/AlGaAs core/shell spherical quantum dots

Zhang

Zhuang

Guo

et al. 2016

Superlattices and Microstructures

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“…In UV-Vis type (UV-1280 and UV1900 Shimadzu) spectrum of (rGO + Ag) films, absorbance peak illustrate in figure3(a), a sharp peak appears at 245 nm for rGO + Ag which due to the presence of r and e to the π →π * transitions of aromatic C-C bonds. While in film rGO + Ag3 peak appears at 422 nm, these peaks' appearances are compatible with the development of silver nanoparticles on the flaks surface, which correlates to the typical surface (Plasmon resonation) [22,23]. The bandgap of the rGO + Ag Nano-composite was calculated using Tauc equation [22]:…”

Section: Ultraviolet-visible Light Spectroscopy (Uv-vis)mentioning

confidence: 91%

“…While in film rGO + Ag3 peak appears at 422 nm, these peaks' appearances are compatible with the development of silver nanoparticles on the flaks surface, which correlates to the typical surface (Plasmon resonation) [22,23]. The bandgap of the rGO + Ag Nano-composite was calculated using Tauc equation [22]:…”

Section: Ultraviolet-visible Light Spectroscopy (Uv-vis)mentioning

confidence: 91%

The Fundamental of Reduced Graphene Oxide with Nanosilver Composite Films Using the Spin Coating Technique

Alaloosi¹,

Noori²,

Jidran³

2022

ETJ

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 The preparation films have good properties in electronic devices, with an energy gap decreasing from 3.4 to 3.1ev with the increase of AgNPs.  The extinction coefficient has the maximum value in the visible region.  The absorption coefficient shows the highest value at 300nm for rGO: AgNPs, and it  The increase of silver nanoparticle concentration increases the extinction coefficient values, similar to absorption coefficient behavior.Graphene oxide synthesis by hummers method and reduction by the green chemical method using green tea. Preparation films with reduced graphene oxide (rGO) and Silver Nanoparticles (AgNPs) by a spin coating method. The preparation films and Nanomaterial characteristics with X-Ray diffraction D has a pea at 2 11.22 . While rGO has a wider pea at 2 26.2 . The (rGO +AgNPs) films have five obvious diffraction angles. In Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX), flaky sheet (rGO), and spherical (AgNPs) with Nanosize about ~20 nm, the peaks of EDX indicated the presence of Carbon, silver, and oxygen. The energy gap was calculated from the absorbance spectrum and seemed to decrease with increasing AgNPs.

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Fabrication and photodetection performance evaluation of nanostructured CdS/Si MSM visible light photodetector

Salih

2024

Optical Materials

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Second-order nonlinear susceptibility in quantum dot structure under applied electric field

Cited by 6 publications

References 22 publications

Donor-impurity-related optical absorption and refractive index changes in GaAs/AlGaAs core/shell spherical quantum dots

Donor-impurity-related optical absorption and refractive index changes in GaAs/AlGaAs core/shell spherical quantum dots

The Fundamental of Reduced Graphene Oxide with Nanosilver Composite Films Using the Spin Coating Technique

Fabrication and photodetection performance evaluation of nanostructured CdS/Si MSM visible light photodetector

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