Electric field effect on the linear and nonlinear intersubband refractive index changes in asymmetrical semiparabolic and symmetrical parabolic quantum wells

2005 ◽  
Vol 37 (4) ◽  
pp. 261-272 ◽  
Author(s):  
Li Zhang
Keyword(s):  
Refractive Index ◽  
Electric Field ◽  
Quantum Wells ◽  
Field Effect ◽  
Electric Field Effect ◽  
Index Changes ◽  
Linear And Nonlinear ◽  
Parabolic Quantum Wells

Linear and nonlinear optical absorption coefficients and refractive index changes in Morse quantum wells under electric field

2016 ◽  
Vol 30 (30) ◽  
pp. 1650209 ◽  
Author(s):  
S. Sakiroglu
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Optical Absorption ◽  
Electric Field ◽  
Quantum Wells ◽  
Nonlinear Optical ◽  
Absorption Coefficients ◽  
Nonlinear Optical Absorption ◽  
Index Changes ◽  
Linear And Nonlinear

In this paper, we investigate theoretically the effects of electric field on the linear and nonlinear optical properties of Morse quantum wells considering a two-level system. The effective mass approximation and the envelope function approach are used to calculate the energy levels and wave functions. The analytical expressions of the optical properties are obtained by using the compact density-matrix approach. The linear and third-order nonlinear optical absorption coefficients and the refractive index changes are investigated as a function of the incident photon energy for several configurations of the structural parameter and the applied electric field. Numerical results, presented for a typical GaAs/AlGaAs quantum well, reveal that the electric field has a significant effect on the optical characteristics of these structures and intersubband transitions can be modified by tuning the structural range parameter of the potential.

LINEAR AND NONLINEAR INTERSUBBAND REFRACTIVE INDEX CHANGES IN WURTZITEAlGaN/GaNDOUBLE QUANTUM WELLS: EFFECTS OF PIEZOELECTRICITY AND SPONTANEOUS POLARIZATION

2009 ◽  
Vol 16 (01) ◽  
pp. 11-17
Author(s):  
L. ZHANG
Keyword(s):  
Refractive Index ◽  
Density Matrix ◽  
Quantum Wells ◽  
Structural Parameters ◽  
Matrix Approach ◽  
Third Order ◽  
Numerical Result ◽  
Analytical Formulas ◽  
Index Changes ◽  
Linear And Nonlinear

Based on the density-matrix approach and iterative treatment, a detailed procedure for the calculation of the linear and nonlinear intersubband refractive index changes (RICs) in wurtzite GaN-based coupling quantum wells (CQWs) is given. The simple analytical formulas for electronic eigenstates and the linear and third-order nonlinear RICs in the systems are also deduced. Numerical result on a typical AlGaN / GaN CQW shows that the linear and nonlinear RICs sensitively depend on the structural parameters of the CQW system as well as the doped fraction of nitride semicondutor.

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