Extraordinary Fast Forward and Backward Light in Transparent Non-Hermitian Systems | |
Zhang, Lingxuan3; Ying, Lei1; Ge, Li2,4; Zhao, Wei3; Zhang, Wenfu3 | |
刊名 | Laser and Photonics Reviews |
关键词 | non-Hermitian photonics pressure sensors superluminal light |
ISSN号 | 18638880;18638899 |
DOI | 10.1002/lpor.202000204 |
产权排序 | 1 |
英文摘要 | The phenomenon of fast forward and backward light pulse propagation in effectively transparent non-Hermitian photonic systems is reported. Specifically, the propagation eigenmodes are analyzed in several parity-time-symmetric coupled waveguides. In contrast to a previous finding that showed slow light due to an exceptional point in such systems, a critical point in its close proximity that displays a diverging dispersion is identified. Superluminal light pulse propagation in the forward and backward directions is then found and observed numerically on the two sides of the critical point, respectively. This abnormal phenomenon can be understood by a conservation relation of group velocities, which can be extended to other transparent non-Hermitian photonic systems with different symmetries. More importantly, the abrupt transition across the critical point between the fast forward and backward light can be tuned, indicating the possibility of detecting atom-scale movement of the waveguides with little time delay. In addition, bandwidth broadening and a passive superluminal propagation configuration are discussed. © 2021 Wiley-VCH GmbH |
语种 | 英语 |
出版者 | John Wiley and Sons Inc |
WOS记录号 | WOS:000630234900001 |
内容类型 | 期刊论文 |
源URL | [http://ir.opt.ac.cn/handle/181661/94574] |
专题 | 西安光学精密机械研究所_瞬态光学技术国家重点实验室 |
通讯作者 | Ge, Li; Zhang, Wenfu |
作者单位 | 1.Interdisciplinary Center for Quantum Information and Department of Physics, Zhejiang University, Hangzhou; 310027, China; 2.The Graduate Center, CUNY, New York; NY; 10016, United States 3.State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; 4.Department of Physics and Astronomy, College of Staten Island, CUNY, Staten Island, New York; 10314, United States; |
推荐引用方式 GB/T 7714 | Zhang, Lingxuan,Ying, Lei,Ge, Li,et al. Extraordinary Fast Forward and Backward Light in Transparent Non-Hermitian Systems[J]. Laser and Photonics Reviews. |
APA | Zhang, Lingxuan,Ying, Lei,Ge, Li,Zhao, Wei,&Zhang, Wenfu. |
MLA | Zhang, Lingxuan,et al."Extraordinary Fast Forward and Backward Light in Transparent Non-Hermitian Systems".Laser and Photonics Reviews |
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