Orbital angular momentum transfer via spontaneously generated coherence

Sabegh, Zahra Amini; Mohammadi, Mohammad; Maleki, Mohammad Ali; Mahmoudi, Mohammad

doi:10.1364/josab.36.002757

Cited by 11 publications

(6 citation statements)

References 39 publications

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“…21 ] whereas ⃗ E pr ∝ Ω pr . Under slowly varying envelope approximation (SVEA) and paraxial approximation, the time-independent Maxwell's wave equation for the propagation of probe beam along z direction can be obtained as [25,28,29],…”

Section: Dynamics Of Probe Beam Propagation Through the Atomic Mediummentioning

confidence: 99%

“…They have found that due to closed loop structure of the CTL system, the non-vortex (Gaussian) probe beam explicitly depends on the OAM of the vortex control beam. Sabegh et al [25] also investigated the spatially dependent probe responses (absorption and dispersion profiles) and the generation of fourth field (GFF) in a closed-loop fourlevel Ξ-type atomic system. Further, they have shown that the microwave-induced OAM transfer be the crucial factor to generate spatially dependent optical responses.…”

Section: Introductionmentioning

confidence: 99%

“…Further, they have shown that the microwave-induced OAM transfer be the crucial factor to generate spatially dependent optical responses. Moreover, the investigation of the OAM transfer from a vortex control beam to non-vortex probe beam has been reported in different atomic systems under various scenarios [26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

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Azimuthal phase-dependent electromagnetically induced transparency and the generation of spatial light in a microwave-assisted four-level Y-type system

Akhtar,

Saha,

Hossain

2024

J. Phys. B: At. Mol. Opt. Phys.

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We present an azimuthal phase-dependent scheme to study the spatially dependent electromagnetically induced transparency (EIT) and the generation of spatial light in a closed-loop four-level Y-type system. A structured control beam and a microwave (MW) field are adopted in the closedloop structure. Interestingly, the weak non-vortex probe beam responses explicitly depend on the orbital angular momentum (OAM) of the control beam along with the MW-assisted quantum interference. The regions of spatially dependent EIT are demonstrated at different azimuthal angles. It is found that the intensity of the structured control beam and the relative phase arising out of the beams participating in the closed-loop can be used as the controlling knobs to tailor the shape and the angular location of the spatially dependent EIT.

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Section: Dynamics Of Probe Beam Propagation Through the Atomic Mediummentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Azimuthal phase-dependent electromagnetically induced transparency and the generation of spatial light in a microwave-assisted four-level Y-type system

Akhtar,

Saha,

Hossain

2024

J. Phys. B: At. Mol. Opt. Phys.

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“…Various theoretical works have been done to determine the role of the SGC in the bistability and mulistability 35 , 36 , atom-photon entanglement 37 , 38 in different atomic systems. Recently, it has been shown that SGC is capable of transferring the orbital angular momentum from a Laguerre–Gaussian field to a weak plane wave 39 . Moreover, Mahmoudi et.al showed that atoms can be cooled to even below recoil temperature under a cooling mechanism based on SGC-induced electromagnetically induced transparency 40 .…”

Section: Introductionmentioning

confidence: 99%

Optical limiting via spontaneously generated coherence

Silatan

GoranAbad

Mahmoudi

2023

Sci Rep

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We investigate the reverse saturable absorption (RSA) and optical limiting (OL) in a three-level V-type quantum system considering the effect of the spontaneously generated coherence (SGC). It is shown that in the absence of the SGC effect, the saturable absorption (SA) is dominant in the system. By taking into account the SGC effect, we prove that the SA dramatically switches to the RSA. Moreover, it is demonstrated that the OL threshold and OL efficiency can be controlled by the SGC effect. In addition, we show that the applied field properties such as detuning can modify the SGC-induced optical limiter efficiency. It is also shown an increase in the atomic density and length of the medium makes the optical limiter more efficient. The analytical calculation shows that the Kerr nonlinearity caused by the SGC effect is the main mechanism of the system evolution. Finally, the theoretical Z-scan experiment is presented to confirm the obtained results. Our proposed scheme can be useful to design controllable atomic optical limiters for optical devices with different sensitivities.

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“…The generation of an OAM-carrying ultraviolet (UV) light through SHG and OAM-entanglement frequency transducer has been experimentally examined by Zhou et al [34,35]. Recent studies deal with the interaction of matter with twisted light and explore the possibility of exchange of optical vortices between different light frequencies [36][37][38][39][40][41][42][43][44][45][46]. Juzelinūas team realized the exchange of OAM modes in four-and five-level quantum systems [43,44].…”

Section: Introductionmentioning

confidence: 99%

Manipulation and exchange of Light with Orbital Angular Momentum in Quantum Dot Molecules

Mahdavi,

Sabegh,

Mohammadi

et al. 2020

Preprint

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We study the interaction of laser pulses carrying orbital angular momentum (OAM) with structural asymmetry quantum dot molecules characterized by four energy levels. We demonstrate how the inter-dot tunneling endows exchange of optical vortices between different frequencies. We consider a case where a weak probe beam has an optical vortex and thus has a zero intensity at the center. The presence of tunneling coupling generates an additional weak laser beam with the same vorticity as that of the incident vortex beam. We analyze conditions for the vortex of the initial beam to be transferred efficiently to the generated beam. The propagation of Laguerre-Gaussian (LG) beams possessing OAM states characterized by both azimuthal and radial indices is then investigated for the case where the strong control beam is also an OAM mode. It is shown that the conservation of OAM states is always satisfied over the OAM exchange process. Yet, an abnormal case is observed in which the radial index induces some intensity patterns of the generated beam which differs from a pure LG beam of incident beams. Analytical solutions are provided to elucidate such effects induced by radial indices on propagation characteristics of OAM beams. When superimposing two initially present weak OAM modes, it is observed that the resulting optical vortices move about the beam axis as the light propagates, forming a sort of constellation around the center. The shift in axis of such a composite pulses is due to the effect of inter-dot tunneling which is controlled by an external electric voltage. The optical angular momenta may add a new degree of freedom in the study of solid systems suitable for quantum technologies.

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Orbital angular momentum transfer via spontaneously generated coherence

Cited by 11 publications

References 39 publications

Azimuthal phase-dependent electromagnetically induced transparency and the generation of spatial light in a microwave-assisted four-level Y-type system

Azimuthal phase-dependent electromagnetically induced transparency and the generation of spatial light in a microwave-assisted four-level Y-type system

Optical limiting via spontaneously generated coherence

Manipulation and exchange of Light with Orbital Angular Momentum in Quantum Dot Molecules

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