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Role of incoherent pumping and Er^(3+) ion concentration on subluminal and superluminal light propagation in Er^(3+)-doped YAG crystal

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Chinese Physics B 2015年第1期24卷 269-274页

作者： seyyed hossein asadpour H.Rahimpour Soleimani Department of Physics University of GuilanRasht Iran

We study the absorption-dispersion process and group index of weak probe field in a four-level Er^3＋：YAG *** find that the Er^3＋ion concentration and incoherent pumping field can influence the absorption-dispersion process and group index of weak probe field. Moreover, our results show that Er^3＋ion concentration plays a major role in lasing without inversion and absorption with inversion.

关键词： Er^3+ion concentration incoherent pumping field superluminal

Phase Control of Transient Optical Properties of Quantum-Dot Nanostructure via Terahertz Signal Radiation

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Chinese Physics Letters 2014年第11期31卷 77-80页

作者： seyyed hossein asadpour H. Rahimpour Soleimani Department of Physics University of Guilan Rasht Iran

We theoretically analyze the transient properties of a probe field absorption dispersion in a quantum-dot nanos- trueture driven by terahertz signal radiation. Here a four-level quantum-dot nanostructure is designed numerically by Schrodinger and Poisson＇s equations. We show that in the presence of the THz signal, the medium becomes phase dependent and the absorption dispersion can be dramatically influenced by the relative phase between applied fields.

关键词： Quantum dots Nanostructured materials Submillimeter waves Schrödinger equation Physics research

Optical bistability and multistability via double dark resonance in graphene nanostructure

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Chinese Physics B 2016年第6期25卷 223-229页

作者： seyyed hossein asadpour G Solookinejad M Panahi E Ahmadi Sangachin Department of Physics Marvdasht BranchIslamic Azad University

Electrons in graphene nanoribbons can lead to exceptionally strong optical responses in the infrared and terahertz regions owing to their unusual dispersion ***,on the basis of quantum optics and solid-material scientific principles,we show that optical bistability and multistability can be generated in graphene nanostructure under strong magnetic *** also show that by adjusting the intensity and detuning of infrared laser field,the threshold intensity and hysteresis loop can be manipulated *** effects of the electronic cooperation parameter which are directly proportional to the electronic number density and the length of the graphene sample are *** proposed model may be useful for the nextgeneration all-optical systems and information processing based on nano scale devices.

关键词： optical bistability optical multistability graphene nanostructure

Enhanced Kerr nonlinearity in a quantized four-level graphene nanostructure

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Chinese Physics B 2016年第7期25卷 234-238页

作者： Ghahraman Solookinejad M Panahi E Ahmadi seyyed hossein asadpour Department of Physics Marvdasht Branch Islamic Azad University

In this paper, a new model is proposed for manipulating the Kerr nonlinearity of right-hand circular probe light in a monolayer of graphene nanostructure. By using the density matrix equations and quantum optical approach, the third-order susceptibility of probe light is explored numerically. It is realized that the enhanced Kerr nonlinearity with zero linear absorption can be provided by selecting the appropriate quantities of controllable parameters, such as Rabi frequency and elliptical parameter of elliptical polarized coupling field. Our results may be useful applications in future all-optical system devices in nanostructures.

关键词： Kerr nonlinearity graphene nanostructure linear absorption

Optical bistability and multistability in a defect slab doped by GaAs/AlGaAs multiple quantum wells

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Chinese Physics B 2016年第5期25卷 223-228页

作者： seyyed hossein asadpour G Solookinejad M Panahi E Ahmadi Sangachin Department of Physics Marvdasht Branch Islamic Azad University

We proposed a new model for controlling the optical bistability（OB） and optical multistability（OM） in a defect slab doped with four-level GaAs/AlGaAs multiple quantum wells with 15 periods of 17.5 nm GaAs wells and 15-nm Al_（0.3）Ga_（0.7）As barriers. The effects of biexciton energy renormalization, exciton spin relaxation, and thickness of the slab on the OB and OM properties of the defect slab were theoretically investigated. We found that the transition from OB to OM or vice versa is possible by adjusting the controllable parameters in a lab. Moreover, the transmission, reflection, and absorption properties of the weak probe light through the slab were also discussed in detail.

关键词： optical bistability optical multistability quantum well nanostructure

Entanglement of three-level atomic system and spontaneous emission fields in a vacuum and near the 1D photonic crystal band gap

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Optoelectronics Letters 2022年第11期18卷 687-693页

作者： Jalil Shiri Javad Khalilzadeh seyyed hossein asadpour Department of Photonics Faculty of SciencesImam Hossein UniversityTehranlran Young Researchers and Elite Club Central Tehran BranchIslamic Azad UniversityTehranIlran

The time evolution of the quantum entropy in a GaAs/AlAs one-dimensional photonic crystal(1DPC) with an atomic system defect layer is investigated in this work. The entanglement between atomic system and their spontaneous emission fields near the edge of the photonic band gap(PBG) is coherently controlled by the coupling field. Comparison between the atom-photon entanglement of the atomic system in the vacuum surrounding and that near the PBG of the 1DPC shows that the degree of entanglement strongly depends on the PBG. We find that degree of entanglement is strongly dependent on the intensity and detuning of the coupling and probe fields. Furthermore, the effect of the phase difference between applied fields on the atom-photon entanglement is studied. The potentially possible technological applications can be provided by the proposed model in the quantum optics and quantum communications based on photonic crystal.

关键词： field system vacuum

Influence of Fano interference and incoherent processes on optical bistability in a four-level quantum dot nanostructure

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Chinese Physics B 2016年第3期25卷 205-209页

作者： seyyed hossein asadpour G Solookinejad M Panahi E Ahmadi Sangachin Department of Physics Marvdasht Branch Islamic Azad University Marvdasht Iran

Role of Fano interference and incoherent pumping field on optical bistability in a four-level designed InGaN/GaN quantum dot nanostructure embedded in a unidirectional ring cavity are analyzed. It is found that intensity threshold of optical bistability can be manipulated by Fano interference. It is shown that incoherent pumping fields make the threshold of optical bistability behave differently by Fano interference. Moreover, in the presence of Fano interference the medium becomes phase-dependent. Therefore, the relative phase of applied fields can affect the behaviors of optical bistability and intensity threshold can be controlled easily.

关键词： optical bistability Fano interference incoherent pumping fields quantum dot nanostructure

Coherent Control of the Goos–Hnchen Shifts in a Four-Level N Type Atomic Medium

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Communications in Theoretical Physics 2014年第12期61卷 864-870页

作者： Parisa Maboodi Soheila Hemmatzadeh seyyed hossein asadpour H.Rahimpour Soleimani Research Institute for Applied Physics and Astronomy University of Tabriz Tabriz Iran Department of Physics University of Guilan Rasht Iran

The behavior of the Goos–H¨anchen(GH) shifts of the reflected and transmitted probe light beams is theoretically investigated. In a fixed geometrical configuration, the effect of quantum interference induced by spontaneous emission on the phase control of the GH shifts is analyzed in this paper. It is found that in a four-level N-type atomic system as an intracavity medium, the GH shifts of the reflected and transmitted probe light beam are completely phase dependent.

关键词： Goos–Hnchen shift quantum interference group index

Er^(3+) ion concentration effect on transient and steady-state behavior in Er^(3+):YAG crystal

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Chinese Physics B 2014年第10期23卷 248-253页

作者： asadpour seyyed hossein Rahimpour Soleimani H Department of Physics University of Guilan

The effect of Er3＋ ion concentration on transient and steady-state behavior in 45-nm Er3＋：YAG crystal is investigated. It is shown that by changing the signal field, the coherent field and the concentration of Er3＋ ions in the crystal, the absorption, dispersion, and group index of the weak probe field can be adjusted. Also, it is found that the probe absorption occurs in the presence of population inversion and probe amplification is obtained in the absence of population inversion.

关键词： Er3+ ion concentration absorption dispersion group index