Seyyed Hossein Asadpour - Profile on Academia.edu (original) (raw)
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Papers by Seyyed Hossein Asadpour
Polarization dependence of optical bistability in the presence of external magnetic field
Optical properties of double cascade-type GaAs/AlGaAs multiple quantum well nanostructures via exciton spin relaxation
Transient absorption–dispersion properties of four-level atomic system via elliptically polarized probe light and magnetic field
Laser polarization dependent and magnetically control of group velocity in a dielectric medium doped with nanodiamond nitrogen vacancy centers
Optical bistability and multistability via biexciton coherence in semiconductor quantum well nanostructure
Subluminal and superluminal pulse propagation via spin coherence in a defect dielectric medium
Phase control of optical bistability based biexciton coherence in a quantum dot nanostructure
North-Holland, Jan 5, 2014
Switching from optical bistability to multistability via terahertz signal radiation in a InGaN/GaN quantum dot nanostructure
North-Holland, Jun 15, 2014
Enhanced Kerr Nonlinearity in a Four-Level EIT Medium
Journal of Nonlinear Optical Physics & Materials, 2010
The linear and nonlinear response of a four-level EIT system driven by three coherent fields is i... more The linear and nonlinear response of a four-level EIT system driven by three coherent fields is investigated. It is found that at appropriate atomic parameters, the Kerr nonlinearity can clearly be enhanced. It is also demonstrated that the maximal Kerr nonlinearity enters the EIT window, and the corresponding linear and nonlinear absorption suppress. Moreover, we show that nonlinear absorption and Kerr nonlinearity can also be changed via relative phase between driving fields.
Journal of Luminescence, 2011
We theoretically investigate the optical bistability (OB) in a V-type three-level atomic system c... more We theoretically investigate the optical bistability (OB) in a V-type three-level atomic system confined in a unidirectional ring cavity via incoherent pumping field. It is shown that the threshold of optical bistability can be controlled by the rate of an incoherent pumping field and by interference mechanism arising from the spontaneous emission and incoherent pumping field. We demonstrate that the optical bistability converts to optical multi-stability (OM) by the quantum interference mechanism.
Lasing without population inversion in an Er-doped YAG crystal
Journal of Modern Optics, 2011
Two atomic models are proposed for an Er3+-doped YAG crystal with application to lasing with and ... more Two atomic models are proposed for an Er3+-doped YAG crystal with application to lasing with and without population inversion. It is shown how an incoherent pumping field and coherent control coupling field can produce a laser in the presence and absence of population inversion.
Physica E-low-dimensional Systems & Nanostructures, 2011
The giant Kerr nonlinearity with reduced linear and nonlinear absorption in a four-level quantum ... more The giant Kerr nonlinearity with reduced linear and nonlinear absorption in a four-level quantum dot by employing the tunnel coupling is investigated. It is shown that by enhancement of tunnel coupling value the Kerr nonlinearity increases and at the same time linear and nonlinear absorption reduces at the long wavelength which is very important for communicational applications. Enhanced of Kerr nonlinearity in a double quantum dots is investigated. It is found that the electron tunneling has an essential role to reducing the linear absorption and increasing the Kerr nonlinearity at long wavelength.
Lasing without population inversion in an Er-doped YAG crystal
Journal of Modern Optics, 2012
Two atomic models are proposed for an Er3+-doped YAG crystal with application to lasing with and ... more Two atomic models are proposed for an Er3+-doped YAG crystal with application to lasing with and without population inversion. It is shown how an incoherent pumping field and coherent control coupling field can produce a laser in the presence and absence of population inversion.
Journal of Luminescence, 2011
We investigate the optical bistability (OB) and optical multi-stability (OM) in a four-level N-ty... more We investigate the optical bistability (OB) and optical multi-stability (OM) in a four-level N-type atomic system. The effect of spontaneously generated coherence (SGC) on OB and OM is then discussed. It is found that SGC makes the medium phase dependent, so the optical bistability and multi-stability threshold can be controlled via relative phase between applied fields. We realize that the frequency detuning of probe and coupling fields with the corresponding atomic transition plays an important role in creation OB and OM. Moreover, the effect of laser coupling fields and an incoherent pumping field on reduction of OB and OM threshold is then discussed.
Enhanced Kerr nonlinearity in a tunnel-coupled double quantum wells
Physica E-low-dimensional Systems & Nanostructures, 2011
The giant Kerr nonlinearity in an asymmetric coupled quantum well (CQW) driven by probe and contr... more The giant Kerr nonlinearity in an asymmetric coupled quantum well (CQW) driven by probe and control laser fields based on intersubband transitions is investigated. The effect of controlling parameters such as intensity of coupling field and electron tunneling on nonlinear behavior of the system is then discussed. It is shown that the enhanced Kerr nonlinearity with reduced linear and nonlinear
In a GaAs quantum well waveguide coupled by orthogonally polarized optical fields, the influence ... more In a GaAs quantum well waveguide coupled by orthogonally polarized optical fields, the influence of spin coherence on the optical bistability (OB) and multistability is investigated. It is shown that OB and multistability are very sensitive to the relative phase between applied fields.
Polarization dependence of optical bistability in the presence of external magnetic field
Optical properties of double cascade-type GaAs/AlGaAs multiple quantum well nanostructures via exciton spin relaxation
Transient absorption–dispersion properties of four-level atomic system via elliptically polarized probe light and magnetic field
Laser polarization dependent and magnetically control of group velocity in a dielectric medium doped with nanodiamond nitrogen vacancy centers
Optical bistability and multistability via biexciton coherence in semiconductor quantum well nanostructure
Subluminal and superluminal pulse propagation via spin coherence in a defect dielectric medium
Phase control of optical bistability based biexciton coherence in a quantum dot nanostructure
North-Holland, Jan 5, 2014
Switching from optical bistability to multistability via terahertz signal radiation in a InGaN/GaN quantum dot nanostructure
North-Holland, Jun 15, 2014
Enhanced Kerr Nonlinearity in a Four-Level EIT Medium
Journal of Nonlinear Optical Physics & Materials, 2010
The linear and nonlinear response of a four-level EIT system driven by three coherent fields is i... more The linear and nonlinear response of a four-level EIT system driven by three coherent fields is investigated. It is found that at appropriate atomic parameters, the Kerr nonlinearity can clearly be enhanced. It is also demonstrated that the maximal Kerr nonlinearity enters the EIT window, and the corresponding linear and nonlinear absorption suppress. Moreover, we show that nonlinear absorption and Kerr nonlinearity can also be changed via relative phase between driving fields.
Journal of Luminescence, 2011
We theoretically investigate the optical bistability (OB) in a V-type three-level atomic system c... more We theoretically investigate the optical bistability (OB) in a V-type three-level atomic system confined in a unidirectional ring cavity via incoherent pumping field. It is shown that the threshold of optical bistability can be controlled by the rate of an incoherent pumping field and by interference mechanism arising from the spontaneous emission and incoherent pumping field. We demonstrate that the optical bistability converts to optical multi-stability (OM) by the quantum interference mechanism.
Lasing without population inversion in an Er-doped YAG crystal
Journal of Modern Optics, 2011
Two atomic models are proposed for an Er3+-doped YAG crystal with application to lasing with and ... more Two atomic models are proposed for an Er3+-doped YAG crystal with application to lasing with and without population inversion. It is shown how an incoherent pumping field and coherent control coupling field can produce a laser in the presence and absence of population inversion.
Physica E-low-dimensional Systems & Nanostructures, 2011
The giant Kerr nonlinearity with reduced linear and nonlinear absorption in a four-level quantum ... more The giant Kerr nonlinearity with reduced linear and nonlinear absorption in a four-level quantum dot by employing the tunnel coupling is investigated. It is shown that by enhancement of tunnel coupling value the Kerr nonlinearity increases and at the same time linear and nonlinear absorption reduces at the long wavelength which is very important for communicational applications. Enhanced of Kerr nonlinearity in a double quantum dots is investigated. It is found that the electron tunneling has an essential role to reducing the linear absorption and increasing the Kerr nonlinearity at long wavelength.
Lasing without population inversion in an Er-doped YAG crystal
Journal of Modern Optics, 2012
Two atomic models are proposed for an Er3+-doped YAG crystal with application to lasing with and ... more Two atomic models are proposed for an Er3+-doped YAG crystal with application to lasing with and without population inversion. It is shown how an incoherent pumping field and coherent control coupling field can produce a laser in the presence and absence of population inversion.
Journal of Luminescence, 2011
We investigate the optical bistability (OB) and optical multi-stability (OM) in a four-level N-ty... more We investigate the optical bistability (OB) and optical multi-stability (OM) in a four-level N-type atomic system. The effect of spontaneously generated coherence (SGC) on OB and OM is then discussed. It is found that SGC makes the medium phase dependent, so the optical bistability and multi-stability threshold can be controlled via relative phase between applied fields. We realize that the frequency detuning of probe and coupling fields with the corresponding atomic transition plays an important role in creation OB and OM. Moreover, the effect of laser coupling fields and an incoherent pumping field on reduction of OB and OM threshold is then discussed.
Enhanced Kerr nonlinearity in a tunnel-coupled double quantum wells
Physica E-low-dimensional Systems & Nanostructures, 2011
The giant Kerr nonlinearity in an asymmetric coupled quantum well (CQW) driven by probe and contr... more The giant Kerr nonlinearity in an asymmetric coupled quantum well (CQW) driven by probe and control laser fields based on intersubband transitions is investigated. The effect of controlling parameters such as intensity of coupling field and electron tunneling on nonlinear behavior of the system is then discussed. It is shown that the enhanced Kerr nonlinearity with reduced linear and nonlinear
In a GaAs quantum well waveguide coupled by orthogonally polarized optical fields, the influence ... more In a GaAs quantum well waveguide coupled by orthogonally polarized optical fields, the influence of spin coherence on the optical bistability (OB) and multistability is investigated. It is shown that OB and multistability are very sensitive to the relative phase between applied fields.