The effects of pressure and hydrogenic donor impurity on the linear and nonlinear optical properties of a GaAs/GaAlAs nanowire superlattice |
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| Institution: | 1. Department of Physics, Payame Noor University, P.O.Box 19395-3697, Tehran, Iran;2. Young Researchers and Elite Club, Shiraz Branch, Islamic Azad University, Shiraz, Iran;1. Donbass State Engineering Academy, Kramatorsk 84313, Ukraine;2. Grupo de Materia Condensada UdeA, Instituto de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia-UdeA, Calle 70 No. 52-21, Medellín, Colombia;3. Escuela de Ingeniería de Antioquia-EIA, Medellín, Colombia;4. Centro de Investigación en Ciencias, Instituto de Investigación en Ciencias Básicas y Aplicadas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, CP 62209 Cuernavaca, Morelos, México;1. Department of Physics, Damavand Branch, Islamic Azad University, Damavand 39718-78911, Iran;2. Young Researchers and Elites Club, Damavand Branch, Islamic Azad University, Damavand 39718-78911, Iran;3. Department of Physics, Iran University of Science and Technology, Narmak, Tehran 16846, Iran;1. Department of Physics, Yeditepe University, Kayısdagı, Atasehir, 34755 Istanbul, Turkey;2. Department of Physics, Middle East Technical University, 06531 Ankara, Turkey;1. Department of Physics, College of Sciences, Yasouj University, Yasouj 75914-353, Iran;2. Department of Physics, Payame Noor University, Shiraz, Iran;3. Department of Physics, Payame Noor University, Tehran, Iran |
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| Abstract: | The combined effects of hydrostatic pressure, presence and absence of hydrogenic donor impurity are investigated on the linear and nonlinear optical absorption coefficients and refractive index changes of a GaAs/Ga1−xAlxAs nanowire superlattice. The wave functions and corresponding eigenvalues are calculated using finite difference method in the framework of effective mass approximation. Analytical expressions for the linear and third order nonlinear optical absorption coefficients and refractive index changes are obtained by means of compact-density matrix formalism. The linear and third order nonlinear absorption coefficient and refractive index changes are presented as a function of photon energy for different values of hydrostatic pressure, incident photon intensity and relaxation time in the presence and absence of hydrogenic donor impurity. It is found that the linear and third order nonlinear absorption coefficients, refractive index changes and resonance energy are quite sensitive to the presence of impurity and applied hydrostatic pressure. Moreover, the saturation in optical spectrum and relaxation time can be adjusted by increasing pressure in presence of impurity whereas the effect of hydrostatic pressure is negligible in the case of absence of hydrogenic impurity. |
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| Keywords: | Nonlinear optics Refractive index Absorption coefficient Hydrogenic donor impurity Hydrostatic pressure Nanowire superlattice |
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