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Laser Physics

Spatially structured optical effects via composite vortex light in a dielectric medium

Ahmed Ahmed Ibrahim, Shaymaa Abed Hussein, Sanaa Fathy Mahmud, Zahraa Hassan Ward, Bahira Abdulrazzaq Mohammed, Khalid Mujasam Batoo, Sajjad Hussain, Enas R. Alwaily, Taha Raad Al-Shaikhli, Hussein Abdullah Abbas, Ahmed Alawadi, Ali Ihsan

Published Mar 20, 2024• 1 citation
Publisher

Abstract

Abstract In this letter, we have proposed a model for spatially structured transmitted and reflected lights from dielectric medium consists of four-level coherent system. An elliptically polarized probe field and a composite vortex light in the presence of external magnetic field are interacted by this medium. We have shown that by controlling the external magnetic field, ellipticity of the probe light and orbital angular momentum (OAM) of the composite vortex light, the transmitted and reflected lights can be controlled. We have also found that due to the spatial pattern of the composite vortex light, the spatially pattern light amplification can be obtained by adjusting the spatial control of the transmitted and reflected lights. In other word, by tuning the OAM number of the composite vortex light and external magnetic field, the spatial controlling of the transmitted and reflected lights are possible and this leads to controlling the high-gain spatially pattern regions.

DOI
10.1088/1555-6611/ad30f9

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We consider the optical rotation of the polarization of a linearly polarized probe field passing through an M-type atomic system by using the interaction between two vortex control fields and optical transitions. We investigate theoretically to generate the spatially dependent structured light with the atoms acting as a spatially varying circular birefringent medium. We show that the polarization and intensity distributions of the vector beam spatially vary by changing the orbital angular momentum (OAM) of the vortex control field.
Abstract We propose an atomic grating based on an electromagnetically induced transparency phenomenon that switches between zeroth-order diffraction to a distinct higher-order diffraction pattern by driving a planar gaseous medium of a four-level tripod ( ⋔ ) atoms with three laser beams: modulation of standing wave control beam propagating nearly perpendicular to the planar medium, while vortex and weak plane probe beams directed perpendicular to the medium. We numerically investigate the behavior of the amplitude, phase modulations, and probe field diffraction intensities of different orders by the variation of the field detunings and orbital angular momentum number of the composite vortex light beam. Specifically, in the off-resonant case, the interplay between a square lattice of the control and an additional spatial variation of the vortex beam allows the emergence of higher diffraction orders and variable gain due to double transparency windows in this complex optical system. We believe that our proposed scheme might be useful in optical memory devices via the storage of information to diffraction orders of the atomic grating.
In this paper, we investigate the spatially dependent absorption characteristics of a four-level atomic mercury system interacting with optical vortex beams carrying orbital angular momentum (OAM). By measuring the imaginary part of the susceptibility of the probe field, we explore the effects of various configurations of control fields on the absorption profile. Initially, we examine the case with a single-composite OAM beam, observing that regions of reduced absorption form flower-like petal patterns, which become more pronounced with increasing OAM values. Introducing a second composite beam with matching or differing OAM values significantly modifies these patterns, leading to enhanced control over the spatial distribution of absorption and transparency. Additionally, we consider the impact of an incoherent pumping field on the transition. Our findings show that the incoherent pumping field further refines the absorption patterns, enabling precise control over the spatial zones of high and low transmission. This effect is particularly pronounced in non-resonant conditions, where the spatial distribution of transparency and absorption can be finely tuned by modifying the OAM characteristics of the composite beams. These results demonstrate the potential of using OAM composite beams and incoherent pumping fields to manipulate light-matter interactions at the quantum level, with applications in high-resolution imaging, quantum information storage, and the creation of complex optical traps for atomic systems.