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Negative Group Velocity in the Absence of Absorption Resonance

Ye, Dexin and Zheng, Guoan and Wang, Jingyu and Wang, Zhiyu and Qiao, Shan and Huangfu, Jiangtao and Ran, Lixin (2013) Negative Group Velocity in the Absence of Absorption Resonance. Scientific Reports, 3 . Art. No. 1628. ISSN 2045-2322. PMCID PMC3620666.

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Scientific community has well recognized that a Lorentzian medium exhibits anomalous dispersion behavior in its resonance absorption region. To satisfy the Krammers-Kronig relation, such an anomalous region has to be accompanied with significant loss, and thus, experimental observations of negative group velocity in this region generally require a gain-assisted approach. In this letter, we demonstrate that the negative group velocity can also be observed in the absence of absorption resonance. We show that the k-surface of a passive uniaxial Lorentzian medium undergoes a distortion near the plasma frequency. This process yields an anomalous dispersion bandwidth that is far away from the absorption resonance region, and enables the observation of negative group velocity at the plasma frequency band. Introducing anomalous dispersion in a well-controlled manner would greatly benefit the research of ultrafast photonics and find potential applications in optical delay lines, optical data storage and devices for quantum information processing.

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Additional Information:© 2013 Nature Publishing Group, a division of Macmillan Publishers Limited. Received: 15 June 2012; Accepted: 25 March 2013; Published: 9 April 2013. This work is sponsored by NSFC under grants 61102003, 61071063 and 61131002. Author contributions: D.Y., G.Z., L.R. designed research; D.Y., J.W., Z.W., S.Q., J.H. performed research; all authors contributed to data interpretation and the composition of the paper. S.Q. supervised the project.
Funding AgencyGrant Number
National Natural Science Foundation of China61102003
National Natural Science Foundation of China61071063
National Natural Science Foundation of China61131002
Subject Keywords:Metamaterials; Ultrafast photonics
PubMed Central ID:PMC3620666
Record Number:CaltechAUTHORS:20130520-160119472
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38582
Deposited By: Jason Perez
Deposited On:21 May 2013 18:04
Last Modified:06 Jul 2020 21:54

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