Induced coherence and optical bistability in a four-level system with incoherent pumping

Osman, K.I.; Joshi, Amitabh

doi:10.1016/j.optcom.2012.11.082

Cited by 35 publications

(17 citation statements)

References 18 publications

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“…It is known that atomic coherence due to the coherent laser field has essential roles for modifying the optical properties of atomic systems such as spontaneously generated coherence (SGC) [1], lasing without inversion [2], modifying spontaneous emission [3], coherent population trapping (CPT) [5], optical bistability [6][7][8][9][10] and so on [11][12][13][14][15][16]. furthermore, it has been shown that quantum interference arising from SGC [8] and incoherent pumping field [17] can be used for analyse of some interesting phenomena such as lasing without population inversion [4], optical bistability [17], and superluminal/subluminal light propagation [18]. Similar phenomena involving quantum coherence in solid state systems such as semiconductor quantum wells (QWs) and quantum dots (QDs) [19], can also be occurred [20,21].…”

Section: Introductionmentioning

confidence: 99%

Controlling the optical properties of a laser pulse at λ = 1.55μm in InGaAs\InP double coupled quantum well nanostructure

Shiri

Malakzadeh

2017

J. Eur. Opt. Soc.-Rapid Publ.

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Background: The transient and steady-state behaviour of the absorption and the dispersion of a probe field propagating at λ = 1.55μm through an InGaAs\InP double coupled quantum well are studied. The effect of terahertz signal excitation, electron tunnelling and incoherent pumping on the optical properties of the probe field is discussed. Methods: The linear dynamical properties of the double coupled quantum well by means of perturbation theory and density matrix method are discussed. Results: We show that the group velocity of a light pulse can be controlled from superluminal to subluminal or vice versa by controlling the rates of incoherent pumping field, terahertz signal and tunnelling between the quantum wells. The required switching time is calculated and we find it between 3 to 15 ps. Conclusions: In the terahertz (30~300 μm or 1~10THz) intersubband transition, the incoming photon energy is (4~41mev) and maybe in the order of electron thermal broadening (KT~6 meV-25 meV for 77 K -300 K). Therefore in the conventional structure, the incoming photon can directly excite the ground state electrons to higher energy levels. It is shown that the absorption and the dispersion of the probe field can be controlled by the intensity of terahertz signal and incoherent pumping field.

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Section: Introductionmentioning

confidence: 99%

Controlling the optical properties of a laser pulse at λ = 1.55μm in InGaAs\InP double coupled quantum well nanostructure

Shiri

Malakzadeh

2017

J. Eur. Opt. Soc.-Rapid Publ.

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“…Quantum coherence and quantum interference are the basic mechanisms for qualifying the reaction of the atomic medium to the applied fields [1]. Many theoretical computations of different nonlinear optical phenomena in different atomic system have been studied by many research groups in two past decades [1][2][3][4][5][6][7][8][9][10][11][12]. One of the most important aspects of these properties is the modification of the absorption, dispersion, and nonlinearity of the system.…”

Section: Introductionmentioning

confidence: 99%

“…One of the most important aspects of these properties is the modification of the absorption, dispersion, and nonlinearity of the system. Due to interaction of optical fields with nonlinear media, many interesting phenomena such as electromagnetically induced transparency [2,3], lasing without inversion (LWI) [4], high refractive index without absorption [5,6], four-wave mixing [7], optical solitons [8], optical bistability [9,10] and so on [11,12] have been investigated. Moreover, experimental evolution of above nonlinear optical phenomena has been reported and discussed.…”

Section: Introductionmentioning

confidence: 99%

Dynamical and Steady State Processes of Probe Absorption-Dispersion in a Four-Level Quantum Dot Nanostructure

et al. 2017

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In this paper, we investigated the transient electron population and the transient behaviour of the dispersion, absorption and refractive property of weak probe light in a four-level InGaN/GaN quantum dot nanostructure. In order to achieve the wave functions and their corresponding energy levels of the mentioned quantum dot nanostructure, the Schrödinger and Poisson equations is solved selfconsistently for carriers (here electron) in quantum dot. Our findings show that the properties of transient processes can be dramatically affected by parameters such as intensity, detuning and relative phase of applied fields. Our proposed scheme provides a realistic model for transient control of refraction index properties in a quantum dot nanostructure. These results may have potential applications in high speed optical switch for quantum information technologies.

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“…Atomic coherence can be achieved by the strong coupling fields, the spontaneous emission and incoherent pumping fields. It is known that atomic coherence due to the coherent laser field has essential roles for modifying the optical properties of atomic systems such as spontaneously generated coherence (SGC) [2], lasing without inversion [3], modifying spontaneous emission [4], coherent population trapping (CPT) [6], optical bistability [7][8][9][10][11] and so on [12][13][14][15][16][17]. Furthermore, it has been shown that quantum interference arising from SGC [8] and incoherent pumping field [18] can be used for analyse of some interesting phenomena such as lasing without population inversion [5], optical bistability [18], and superluminal/ subluminal light propagation [19].…”

Section: Introductionmentioning

confidence: 99%

Role of Terahertz Radiation on Optical Properties of Laser Pulse in a Double Coupled Quantum Well Nanostructure

Shiri¹,

Malakzadeh²

2017

J Laser Opt Photonics

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The transient and steady-state behavior of the absorption and the dispersion of a probe pulse laser field propagating through an InGaAs\InP double coupled quantum well are studied. The effect of terahertz radiation excitation, electron tunnelling and incoherent pumping on the optical properties of the probe field is discussed. In the terahertz (30~300 µm or 1~10 THz) intersubband transition, the incoming photon energy is (4~41 mev) and maybe in the order of electron thermal broadening (KT~6 meV-25 meV for 77 K-300 K). Therefore in the conventional structure, the incoming photon can directly excite the ground state electrons to higher energy levels and this process inhabits the correct optical switching in terahertz applications. We show that the group velocity of a light pulse can be controlled from superluminal to subluminal or vice versa by controlling the rates of incoherent pumping field and tunnelling between the quantum wells. The required switching time is calculated and we find it between 3 to 26 picoseconds.

show abstract

Induced coherence and optical bistability in a four-level system with incoherent pumping

Cited by 35 publications

References 18 publications

Controlling the optical properties of a laser pulse at λ = 1.55μm in InGaAs\InP double coupled quantum well nanostructure

Controlling the optical properties of a laser pulse at λ = 1.55μm in InGaAs\InP double coupled quantum well nanostructure

Dynamical and Steady State Processes of Probe Absorption-Dispersion in a Four-Level Quantum Dot Nanostructure

Role of Terahertz Radiation on Optical Properties of Laser Pulse in a Double Coupled Quantum Well Nanostructure

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