MULTI-FREQUENCY GROUP VELOCITY CONTROL OF LIGHT IN Rb ATOMIC GAS UNDER AN EXTERNAL MAGNETIC FIELD
Year: 2025
Type: article
Abstract: The control of light group velocity via electromagnetically induced transparency (EIT) has opened up potential applications in photonic technologies such as information encoding, quantum processing, and optical switching. For traditional three-level atomic systems only allow light control within a narrow frequency range, limiting multi-channel applications. To overcome this limitation, this study focuses on multi-frequency group velocity control in a 87Rb atomic medium under the influence of an external magnetic field. By combining the semiclassical theory with analytical methods, we derive the expressions for the absorption, dispersion, and group index of a four-level atomic system. Based on these results, we investigate the influence of the magnetic field and laser parameters on the absorption, dispersion, and group index. The findings not only shed light on the mechanism for controlling multi-frequency light, but also suggest potential directions for developing flexible photonic devices that meet the future demands of multi-channel information processing. Keywords: Electromagnetically induced transparency; light group velocity; external magnetic field; four-level atomic configuration
Authors: NGUYEN Van Phu, VO Thi Hong Yen, LE Van Doai, HO Hai Quang, THAI Van Ton, PHAN Duc Thuan, LE Nguyen Mai Anh
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W4414553400
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