Optimizing the optical absorption coefficient of a core/shell quantum dot near a bimetallic nanoparticle

2020 ◽  
Vol 74 (6) ◽  
Author(s):  
Naser Zamani ◽  
Alireza Keshavarz ◽  
Hamid Nadgaran
Keyword(s):  
Optical Absorption ◽  
Quantum Dot ◽  
Absorption Coefficient ◽  
Optical Absorption Coefficient ◽  
Core Shell ◽  
Bimetallic Nanoparticle

INTERSUBBAND OPTICAL ABSORPTION COEFFICIENTS AND REFRACTIVE INDEX CHANGES OF AN ELLIPSOIDAL FINITE POTENTIAL QUANTUM DOT

2010 ◽  
Vol 19 (01) ◽  
pp. 131-143 ◽  
Author(s):  
G. REZAEI ◽  
M. R. K. VAHDANI ◽  
M. BARATI
Keyword(s):  
Refractive Index ◽  
Light Intensity ◽  
Optical Absorption ◽  
Quantum Dot ◽  
Absorption Coefficient ◽  
Optical Absorption Coefficient ◽  
Matrix Formalism ◽  
Ellipsoidal Quantum Dot ◽  
Index Changes ◽  
Intersubband Optical Absorption

Intersubband optical absorption coefficient and refractive index changes of a weakly prolate ellipsoidal quantum dot, using the compact-density matrix formalism and iterative method, are investigated. In this regard, the linear and nonlinear intersubband optical absorption coefficient and refractive index changes of a GaAs / Al x Ga 1-x As ellipsoidal quantum dot, as functions of the dot radius, ellipticity constant, stoichiometric ratio and incident light intensity are calculated. The results indicate that absorption coefficient and refractive index changes strongly depend on the light intensity, size and geometry of the dot and structure parameters such as aluminium concentration in GaAs / Al x Ga 1-x As structures.

INTERSUBBAND OPTICAL ABSORPTION IN CYLINDRICAL QUANTUM DOT QUANTUM WELL

2009 ◽  
Vol 23 (14) ◽  
pp. 3179-3186 ◽  
Author(s):  
RUI-ZHEN WANG ◽  
KANG-XIAN GUO ◽  
BIN CHEN ◽  
YUN-BAO ZHENG
Keyword(s):  
Optical Absorption ◽  
Quantum Dot ◽  
Quantum Well ◽  
Absorption Coefficient ◽  
Optical Absorption Coefficient ◽  
Matrix Approach ◽  
Optical Intensity ◽  
Compact Density ◽  
Incident Optical Intensity ◽  
Intersubband Optical Absorption

The intersubband optical absorption in cylindrical quantum dot quantum well (QDQW) for different sizes of QDQW is theoretically studied. The analytical expression of the absorption coefficient is derived by using the compact density-matrix approach and the iterative method. And the numerical calculations are presented for a typical GaAs / AlGaAs QDQW. The results obtained show that the optical absorption coefficient in the QDQW can be importantly modified by size of shell well. Moreover, they also show that the optical absorption is strongly dependent on the incident optical intensity.

scholarly journals Optical Absorption Coefficient on-center donor impurity in a spherical core/shell quantum dots

2020 ◽  
Vol 330 ◽  
pp. 01041
Author(s):  
Safae M'zerd ◽  
M. El Haouari ◽  
E. Feddi ◽  
M. E. Mora-Ramos ◽  
A. Jorio ◽  
...  
Keyword(s):  
Optical Absorption ◽  
Quantum Dot ◽  
Great Influence ◽  
Optical Absorption Coefficient ◽  
Core Shell ◽  
Donor Impurity ◽  
Third Order ◽  
Confining Potential ◽  
Mass Approximation ◽  
Spherical Core

The polaronic effect on the linear, third-order nonlinear and total optical absorption coefficients have been calculated in the case of GaAs/AlAs core/shell quantum dot, with the impurity is positioned at the central radial position of the GaAs shell. The calculations are realized in the framework of the effective mass approximation and the numerical results are obtained by using a variational method and an infinite confining potential. The results show that the polaronic effect has a great influence on optical properties of core/ shell quantum dot, he causes a red-shift of the nonlinear optical coefficients associated to light absorption. Also, the polaronic effect is enhanced with the decreasing of quantum dot radius.

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