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Results in Physics

Combining six superluminal and subluminal structured light fields with right and left circular polarizations in a chiral medium through superposition

Muhammad Bilal, Vakkar Ali, Tareq Saeed, Ebrahem A. Algehyne

Published Apr 6, 2024• 0 citations
Publisher

Abstract

The structured vector fields of circularly polarized light , comprising both left and right (RCP and LCP) beams superposed in the atomic medium are investigated in this work. At resonance in the anomalous/normal dispersion area, both RCP and LCP beams with a non-negative and non-positive group index of ± 40 have been recorded. RCP and LCP beam group velocities are enhanced to ± 1 . 5 × 1 0 9 m / s at δ = 0 . 15 Γ , that is surpassing the speed of light in vacuum, denoted as ”c” leading to superluminal propagation. The RCP is superluminal and the LCP subluminal at the resonance point of the probe field. The group delay for The LCP beam is positive and the RCP beam is non-positive. The worth of the group delay for RCP and LCP beams varies to ± 4 n s . The superposing structured vectors field of superluminal and subluminal circularly polarized light beams on the right and left E R , L ( r , φ ) are strong variation function of detuning of probe field δ / Γ , Rabi frequency of control field Λ 3 / Γ and phase of collective driving fields φ . The results are useful for the modification of powerful computers.

DOI
10.1016/j.rinp.2024.107643

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The control and enhancement of superluminal pulse propagation via a chiral quantum-dots (QDs) system is presented in this article. The proposed system is a double chiral QDs four-level system, that gets excited by pump and probe fields, along with inter-dot tunneling strength. It is observed that the strength of inter-dot tunneling strongly influences the left-circular polarized (LCP) and right-circular polarized (RCP) superluminal pulse propagation. By appropriately modulating this strength, optimal coherence within the system can be achieved, thereby contributing to enhanced superluminal pulse propagation. We have examined the characteristics of RCP and LCP beams and observed the large negative group index and advance time. The observation of a large negative group index and advanced time shows strong evidence for enhanced superluminal pulse propagation in the proposed chiral QDs system. This study has important applications in the field of optical information processing, temporal cloaking, quantum communication, and improving computer chip speed.
Abstract We propose a scheme for distortion free left/right circularly polarized beams in a chiral atomic medium in a tripod-type configuration using the superposition of atomic states. We measure and control the group index, group velocity and delay and advance times for left/right circularly polarized beams in a transparent chiral atomic medium by varying the population distribution probability in the superposition states. For the left and right circularly polarized beams of the probe field, delay and advance times have been observed at resonance and away from resonance. A negligible distortion and large phase shift in the left/right circularly polarized beams is theoretically investigated in the system. The results show potential applications in telecommunication, cloaking base technology and information processing.
Abstract This study examines the phenomenon birefringence of anomalous rotary photon drag in a chiralatomic medium by analyzing the effects on left and right circularly polarized beams. The maximumanomalous rotary photon drags for RCP beam is measured to −6.2 nanoradian and for LCP beamis measured to −11 nanoradian. Detuning and Rabi frequencies of control fields reduce dragon LCP and RCP beams. The anomalous rotary photon drag for RCP beam maximized to −8nanoradian and LCP beam is maximized to −11 nanoradian at the control field Rabi frequency,while at other control Rabi frequency are maximized to −9.5 nanoradian and −30 nanoradianforRCP/LCP beams. The results shows signeficant application imaging coding technology.
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Abstract We examine propagation of the linear polarized pulse through a medium containing four-level double V-type atoms. The medium is made chiral by the cross coupling of the applied electromagnetic fields. We show that such medium can be used as a polarization splitter of the probe pulse where the spatially refracted left and right circular polarized components propagate independently due to their distinct phase velocities. We find that dispersion characteristics of the chiral medium can be manipulated by the controlling parameters of the system. Consequently, both the left and right circular polarized components exhibit sub and superluminal propagation characteristics for suitable choices of the probe field detuning and external control fields. It is found that for both polarized components a switching from sub to superluminal behavior may be achieved by adjusting the probe field detuning. In addition, splitting of the left and right circular polarized components and hence peak value of the group time delay and advance may be tuned via the strengths of the control fields. Our results may find applications in spintronics, magnetic quantum optics, images coding and cloaking technology.