Exciton effects on the refractive index and optical absorption in wurtzite quantum wells via a fractional-dimensional space approach

2011 ◽  
Vol 50 (2) ◽  
pp. 128-138 ◽  
Author(s):  
Fengmei Yu ◽  
Lin Zhang ◽  
Kangxian Guo
Keyword(s):  
Refractive Index ◽  
Optical Absorption ◽  
Quantum Wells ◽  
Dimensional Space ◽  
Space Approach

LINEAR AND NONLINEAR INTERSUBBAND OPTICAL ABSORPTION OF FINITE AND INFINITE SEMI-PARABOLIC QUANTUM WELLS

2011 ◽  
Vol 25 (07) ◽  
pp. 497-507 ◽  
Author(s):  
M. J. KARIMI ◽  
A. KESHAVARZ ◽  
A. POOSTFORUSH
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Optical Absorption ◽  
Quantum Well ◽  
Quantum Wells ◽  
Resonant Peak ◽  
Energy Eigenvalues ◽  
Finite Case ◽  
Infinite Case ◽  
Index Changes

In this work, the optical absorption coefficients and the refractive index changes for the infinite and finite semi-parabolic quantum well are calculated. Numerical calculations are performed for typical GaAs / Al x Ga 1-x As semi-parabolic quantum well. The energy eigenvalues and eigenfunctions of these systems are calculated numerically. Optical properties are obtained using the compact density matrix approach. Results show that the energy eigenvalues and the matrix elements of the infinite and finite cases are different. The calculations reveal that the resonant peaks of the optical properties of the finite case occur at lower values of the incident photon energy with respect to the infinite case. Results indicate that the maximum value of the refractive index changes for the finite case are greater than that of the infinite case. Our calculations also show that in contrast to the infinite case, the resonant peak value of the total absorption coefficient in the case of the finite well is a non-monotonic function of the semi-parabolic confinement frequency.

Excitonic and impurity-related optical transitions in Beδ-dopedGaAs∕AlAsmultiple quantum wells: Fractional-dimensional space approach

2005 ◽  
Vol 72 (23) ◽  
Author(s):  
J. Kundrotas ◽  
A. Čerškus ◽  
S. Ašmontas ◽  
G. Valušis ◽  
B. Sherliker ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Dimensional Space ◽  
Optical Transitions ◽  
Space Approach

Nonlinear Intersubband Optical Absorption Coefficient and Refractive Index Changes in Asymmetric Parabolic Double Quantum Wells

2017 ◽  
Vol 6 (1) ◽  
pp. 121-125 ◽  
Author(s):  
Menberu Mengesha Woldemariam
Keyword(s):  
Refractive Index ◽  
Optical Absorption ◽  
Absorption Coefficient ◽  
Quantum Wells ◽  
Optical Absorption Coefficient ◽  
Double Quantum ◽  
Absorption Coefficients ◽  
Total Change ◽  
Left Handed ◽  
Index Changes

The change in optical absorption coefficients and refractive index in GaAs-AlGaAs asymmetric parabolic double quantum wells (DQWs) with applied electric field are studied in detail. Analytical expressions for the linear, nonlinear and total intersubband absorption coefficient and refractive index changes are obtained by using compact density matrix approach. It is found that the magnitude of the nonlinear part of the change in refractive index and absorption coefficients are larger than the linear part in the given frequency region. The value of the total change in refractive index is negative and the asymmetric DQWs becomes left handed media. This property is of great importance for metamaterials science and can contribute substantially to the present search for simple and inexpensive left handed media. Moreover the negative value of the total change in absorption coefficient may be used for developing optical device such as maser at different frequency regime.

High precision parabolic quantum wells grown using pulsed analog alloy grading technique: Photoluminescence probing and fractional-dimensional space approach

2021 ◽  
pp. 118321
Author(s):  
Mindaugas Karaliūnas ◽  
Evelina Dudutienė ◽  
Aurimas Čerškus ◽  
Justas Pagalys ◽  
Simona Pukienė ◽  
...  
Keyword(s):  
Quantum Wells ◽  
High Precision ◽  
Dimensional Space ◽  
Parabolic Quantum Wells ◽  
Space Approach
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