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Journal of Physics B Atomic Molecular and Optical Physics

Two-dimensional electromagnetically induced cross-grating in a four-level N -type atomic system

Jianchun Wu, Bao-quan Ai

Published Apr 17, 2015• 25 citations
Publisher

Abstract

Abstract We propose a scheme for a two-dimensional (2D) electromagnetically induced cross-grating (EICG) in a four-level N -type atomic system. By employing standing-wave fields interacting with the atomic system, the absorption and dispersion of the probe field will change with the spatial periodical modulation. The first-order diffraction intensity sensitively depends on the parameters (the probe detuning, and the amplitude and detuning of the standing-wave fields), and can reach its maximum on varying the system parameters. The present studies may be instructive to design new devices in all-optical switching and optical imaging.

DOI
10.1088/0953-4075/48/11/115504

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Abstract We proposed a theoretical scheme for two-dimensional (2D) electromagnetically induced grating (EIG) in a closed-loop four-level atomic system driven by a weak probe field, a traveling-wave control field, two orthogonal standing-wave fields and a microwave field. Due to low amplitude modulation accompanied with large phase modulation, EIG can be obtained and the probe energy can be diffracted into first-order and even high-order directions with high efficiency. The results show that the diffraction pattern and efficiency of the EIG could be adjusted effectively by the probe field detuning, the coherent field intensity, the interaction length. Meanwhile, the quantum interference between the amplitude modulation and phase modulation can be manipulated by the relative phase, which can be used to regulate the diffraction pattern and efficiency of the 2D EIG. Our scheme of 2D EIG may be useful in beam splitting and all-optical switching.
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Abstract We propose a scheme of two-dimensional electromagnetically induced grating in a three-level Ladder-type atomic system, which is driven by a weak probe field, two orthogonal standing-wave fields, and an incoherent pump field. Due to the position-dependent atom-field interaction, the periodical susceptibility of the probe field can be obtained. By using an incoherent pump field, one can control the absorption (gain) and dispersion of the probe field. By choosing proper parameters, a electromagnetically induced gain-phase grating can be formed in the present system, and the probe energy can be diffracted from zeroth-order into high-order directions. Our scheme may be useful to design new photonic devices in optical information processing.
Abstract A new theoretical scheme for two-dimensional (2D) electromagnetically induced grating (EIG) is proposed in a three-level Ξ-type atomic system. The system is driven by a weak probe field and two position-dependent coupling fields—a 2D standing-wave field and a vortex field. Due to lopsided spatial modulation of the vortex Laguerre–Gaussian field, the weak probe light could be diffracted into different domains and asymmetric 2D EIG is formed. The result shows that the diffraction patterns and efficiency could be effectively modulated by the azimuthal parameter of the vortex field. Also, the system parameters such as the probe field detuning, the intensity of the vortex field, and the interaction length could be used to regulate the diffraction properties of the 2D EIG effectively. The scheme of asymmetric 2D EIG may have some potential application in all-optical information processing and the design of quantum devices.