Theoretical estimation of optical absorption coefficient inside an InAs/InGaAs semiconductor Quantum Dot

2011 ◽  
Author(s):  
Sadreddin Behjati Ardakani ◽  
Hassan. Kaatuzian
Keyword(s):  
Optical Absorption ◽  
Quantum Dot ◽  
Absorption Coefficient ◽  
Optical Absorption Coefficient ◽  
Theoretical Estimation ◽  
Semiconductor Quantum Dot

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.

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