Tunable superluminal propagation at spectral hole-burning regions in magneto-optical atomic medium

Khan, A., Gu, X., Gao, L., Hou, L. , Akbar, J. and Gao, D. (2024) Tunable superluminal propagation at spectral hole-burning regions in magneto-optical atomic medium. Results in Physics, 58, 107507. (doi: 10.1016/j.rinp.2024.107507)

Abstract

In the context of spectral hole-burning, normal dispersion with subluminal propagation is usually observed in the spectral hole-burning depth region. However, anomalous dispersion can occur in the continuous absorption peak region, which leads to superluminal light propagation. In this paper, we report an unusual behavior of dispersion at discontinued absorption kink regions. We demonstrate both normal dispersion at the kink absorption region and anomalous dispersion at the spectral hole-burning depth region. The unusual dispersion leads to a positive group index in the absorption kink region and a negative group index in the spectral hole-burning depth region. The spectral hole-burning is due to variation of magnetization rather than the molecular distribution. The outcomes of our work offer promising applications in communication technologies and storage devices.

• Item Type: Articles
• Additional Information: This work was supported by the National Natural Science Foundation of China (12174281, 12274314); Natural Science Foundation of Jiangsu Province (BK20221240); Suzhou Basic Research Project (SJC2023003).
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Hou, Dr Lianping and Akbar, Mr Jehan

Creator Roles

Hou, L.: Validation, Formal analysis
Akbar, J.: Writing – review and editing, Supervision, Conceptualization

• Authors: Khan, A., Gu, X., Gao, L., Hou, L., Akbar, J., and Gao, D.
• College/School: College of Science and Engineering > School of Engineering; College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Journal Name: Results in Physics
• Publisher: Elsevier
• ISSN: 2211-3797
• ISSN (Online): 2211-3797
• Published Online: 26 February 2024
• Copyright Holders: Copyright: © 2024 The Author(s)
• First Published: First published in Results in Physics 58: 107507
• Publisher Policy: Reproduced under a Creative Commons licence