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Laser Physics Letters

Propagation of the probe field through a chiral medium with four-level atoms

Fazal Badshah, Abdul Basit, Hamad Ali, Haiyang Zhang, Qing He, Guo-Qin Ge

Published Jan 29, 2019• 5 citations
Publisher

Abstract

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.

DOI
10.1088/1612-202x/aafd1d

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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.
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Abstract This paper reports theoretical investigation of birefringence in a chiral medium for the creation of temporal cloaking. The chiral medium splits the input probe beam into left/right circular polarized beams. These left/right circular polarized beams are then controlled and modified within the chiral medium. The left circular polarized beam delays by 24 ns whereas the right circular polarized beam advances by −23 ns at a control field of rabbi frequency 6 γ . This opens a 47 ns time gap for temporal cloaking to hide information without noise corruption and energy loss. The results have potential applications in communication devices for secure propagation of light pulse.
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.
The influence of external magnetic field and relative phase between two electric field components of the probe field on absorption–dispersion and group index of a four-level atomic system with two degenerate sublevels are investigated. The results show that, the behaviors of weak probe light can be controlled by an external magnetic field. It is shown that in the presence of the external magnetic field the additional electromagnetically induced transparency (EIT) window can be obtained. Our result also reveal that the switching from slow to fast light or vice versa can be manipulated by changing the phase difference between the two circularly polarized components of a single coherent field.
The study investigate control of the optical force and its modification with variation of the driving field’s strength in the system levels of the chiral medium for left and right circular polarized light. In addition to orbital and magnetic and spin quantum numbers of applied fields, significant vector field arrows of optical force in chiral media are examined using spatial coordinates, detuning , Rabi frequency and decay rates. The parameters of the probe and control fields’ detuning along with their decay rates and phases are provided to determine the optical force in chiral medium both for left and right circularly polarized fields. The optical force is a function of orbital, magnetic and spin quantum numbers. Using phase, detuning, and Rabi frequency of the control fields as variables, the minimum value of optical force measure is 0.003pN for probe detuning and spatial coordinate while the maximum value of optical force for normalized detuning and transverse radial coordinate is measured to be 0.2pN. Potential uses of optical force in fundamental optics, molecular physics, optomechanics, material science, nanoscience, quantum physics, radar, waveguide, antennas and optical tweezers technology are demonstrated by the results.