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Physical Review A

Spontaneously generated structured light in a coherently driven five-level M-type atomic system

Muqaddar Abbas, Urgunoon Saleem, Rahmatullah Rahmatullah, Yong-Chang Zhang, Pei Zhang

Published Feb 22, 2024• 10 citations
Publisher

Abstract

We propose a scheme to analyze the generation and detection of optical vortices via spontaneous emission spectra. We consider a five-level M-type atomic system that interacts with two structured coherent light sources and the vacuum radiation field. The photon emitted via spontaneous decay carries information about the orbital angular momentum (OAM) of the newly generated structured light. It is found that by varying the OAM of the driving fields, one can obtain various unique structured light fields via the interference of the two spontaneous decay channels. This research provides deep insights into how the manipulation of OAM of the driving fields coupled with multilevel atomic systems can enable control over the azimuthal aspects of the spontaneous emission. Considering the rich applications of structured light ranging from optical storage to optical communication, our proposal might be useful in quantum information processing techniques.

DOI
10.1103/physreva.109.023716

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We propose a scheme to analyze the generation and detection of optical vortices via spontaneous emission spectra. We consider a five-level M-type atomic system that interacts with two structured coherent light sources and the vacuum radiation field. The photon emitted via spontaneous decay carries information about the orbital angular momentum (OAM) of the newly generated structured light. It is found that by varying the OAM of the driving fields, one can obtain various unique structured light fields via the interference of the two spontaneous decay channels. This research provides deep insights into how the manipulation of OAM of the driving fields coupled with multilevel atomic systems can enable control over the azimuthal aspects of the spontaneous emission. Considering the rich applications of structured light ranging from optical storage to optical communication, our proposal might be useful in quantum information processing techniques.
We propose an efficient scheme to manipulate spontaneous emission spectra using optical vortices carrying orbital angular momentum (OAM) in a coherently driven cold five-level atomic system assisted by a radio frequency (RF) or microwave field. Using experimentally achievable parameters, we find that the spontaneous emission is strongly influenced by quantum destructive interference. And we show that the structured light profile of the probe field can be transferred to the spontaneous emission spectrum via spontaneously generated coherence (SGC). With the aid of SGC, the intensities and detunings of the control and RF fields can be used to tailor the vortex-induced spontaneous emission spectra. When the control and RF fields are configured as vortex beams, it is demonstrated that the spontaneous emission can be coherently controlled through quantum interference by adjusting their topological charges (TCs). Furthermore, we explore intriguing optical properties of the vortex-induced spontaneous emission by varying the TCs of the probe and control fields. This coherently driven atomic system features three closely spaced levels, giving rise to multiple vortex-induced SGC pathways. Our scheme opens avenues for applications in structured light, ranging from optical storage to optical communication.
We propose a scheme aimed at achieving spatiospectral control over spontaneous emission within a four-level atom-light coupling system interacting with optical vortices carrying orbital angular momentum (OAM). The atom comprises a ground level and two excited states coupled with two laser fields, forming a V subsystem where the upper states exclusively decay to a common fourth state via two channels. By investigating various initial states of the atom and considering the presence or absence of quantum interference in spontaneous emission channels, we analyze how the characteristics of the OAM-carrying vortex beam imprint onto the emission spectrum. The interplay between the optical vortex and the quantum system, including its environment modes, induces a wide variety of spatiospectral behavior, including two-dimensional spectral-peak narrowing, spectral-peak enhancement, spectral-peak suppression, and spontaneous emission reduction or quenching in the spatial azimuthal plane. Our findings shed light on the dynamics of atom--vortex-beam light interactions and offer insights into the manipulation of emission properties at the quantum level.
A scheme is proposed for two-dimensional atom localization in the subwavelength domain via controlled spontaneous emission. We consider a five-level M-type atomic system interacting with two orthogonal standing-wave laser fields and the vacuum of the radiation field. The interaction of the atom with space-dependent standing-wave fields can provide information about the position of the atom passing through, thus leading to atom localization. It is found that the localization is significantly improved due to the interference effect between the spontaneous decay channels and the dynamically induced quantum interference generated by the two standing-wave fields. By properly varying the system parameters, we can achieve high-precision and high-resolution atom localization.
We propose a scheme for achieving spatially dependent spontaneous emission by using vortex light beams (OAM) in a five level atomic configuration. It consists of an upper excited level and four lower metastable levels. The excited level is simultaneously coupled to two ground levels by a coherent probe field and a vortex field, respectively. In addition, a microwave field couples two of the ground levels. The excited state is assumed to be coupled by the vacuum modes in the free space and eventually decays to a fifth metastable level. It is found that by manipulating key parameters such as the strength of the Laguerre–Gauss beams, the Rabi frequency and detuning of an external microwave field, and the initial state of the atoms, we can achieve highly tunable spontaneous emission spectra . A wide variety of spatiospectral behavior, including two-dimensional spectral-peak narrowing, spectral-peak enhancement and spontaneous emission quenching is obtained.
Abstract We study various coherent optical properties, e.g., two-photon electromagnetically induced transparency (EIT) and three-photon electromagnetically induced transparency and absorption (TPEIT/TPEIA), in a four-level ladder (Ξ)-type system of 87Rb atoms, where the probe and control fields are Gaussian-shaped laser beams and the pump field is structured laser beam. Additionally, the generated four-wave mixing (FWM) signal has been studied. Interestingly, it is found that the generated FWM signal is spatially structured along with the azimuthal phase, which carries the orbital angular momentum (OAM) of light. It is also observed that the coherent optical responses (EIT, TPEIT/TPEIA, and FWM signals) can be manipulated by utilizing the OAM number of the pump beam as a control knob.
This study presents an innovative scheme for detecting the orbital angular momentum (OAM) of vortex beams within an atomic ensemble. Leveraging a homogeneously broadened four-level atomic system driven by two orthogonal polarization probe beams, we demonstrate the selective generation of structured beams without the need for magnetic fields between the two ground states. Through detailed theoretical analysis and numerical simulations, we elucidate the phase-dependent behavior of atomic coherences induced by an OAM-carrying Laguerre–Gaussian optical probe beam. These findings enable the creation of petal-like structures within the probe beam, with the number of petals directly correlated to the OAM value. Our investigation underscores the potential of this OAM detection scheme as a highly sensitive and precise sensor, applicable across diverse domains such as telecommunication, microscopy, and optical metrology.