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Nonlinear optical rectification in asymmetrical semiparabolic quantum wells
Scopus
Toplam 149 atıf DOI
The optical rectification in a semiparabolic quantum well is theoretically investigated. The electronic states in a semiparabolic quantum well are calculated exactly, within the envelope function and the displaced harmonic oscillator approach. The nonlinearity resulting from the asymmetry of the confining potential is studied in the lowest order. The numerical results for the typical AlxGa1-xAs/GaAs material show that the large optical rectification coefficient decreases with increasing confining potential frequency of the semiparabolic quantum well. Moreover, the optical rectification coefficient also depends sensitively on the relaxation rate of semiparabolic quantum well system. © 2005 Elsevier Ltd. All rights reserved.
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Linear and nonlinear intersubband optical absorption coefficients and refractive index changes in a quantum box with finite confining potential
Scopus
Havuzumuzda 254 atıf almış
In this work, both the intersubband optical absorption coefficients and the refractive index changes are calculated exactly in a quantum box. Analytical expressions for the linear and nonlinear intersubband absorption coefficients and refractive index changes are obtained by using the compact-density matrix approach. Numerical results are presented for typical GaAs/AlxGa1-x As quantum box system. The linear, third-order nonlinear and total absorption and refractive index changes are investigated as a function of the incident optical intensity and structure parameters such as box-edge length and stoichiometric ratio. Our results show that both the incident optical intensity and the structure parameters have a great effect on the total absorption and refractive index changes. © 2006 Elsevier B.V. All rights reserved.
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Kurumlar (1)
Selçuk Üniversitesi
Selçuklu, Turkey