Effect of spontaneously generated coherence in controlling the optical bistability and multistability in a left-handed four-level atomic system

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• 作者：A. Jafari ; R. Naderali ; S. Bakkeshizadeh
• 关键词：Left ; handed ; Optical bistability ; Spontaneously generated coherence
• 刊名：Optical and Quantum Electronics
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：48
• 期：1
• 全文大小：669 KB
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• 作者单位：A. Jafari (1)
  R. Naderali (1)
  S. Bakkeshizadeh (1)
  
  1. Atomic and Molecular Group, Department of Physics, Faculty of Science, Urmia University, Urmia, Iran
  
• 刊物主题：Optics, Optoelectronics, Plasmonics and Optical Devices; Electrical Engineering; Characterization and Evaluation of Materials; Computer Communication Networks;
• 出版者：Springer US
• ISSN：1572-817X

文摘

In this paper, we theoretically investigated the influence of spontaneously generated coherence (SGC) on electromagnetic characteristics, and optical bistability (OB) and optical multistability (OM) of dense four-level atomic system. In the absence of the SGC effect, this atomic system exhibits left-handed property in one frequency detuning band of the probe field, while in the presence of the SGC effect it exhibits left-handed property in two frequency detuning bands of the probe field. The real and imaginary parts of the refractive index have negative values in the same frequency band. We can use this atomic system as an active medium for amplification of electromagnetic fields. In the absence of the SGC effect, we can easily control the transition between the OB and the OM effects by modifying the sign of the refractive index. In the presence of the SGC effect, we observe the OM behavior in this system such that the threshold of the OM in the negative refractive index band is less than the positive refractive index band. In this system, the negative refractive index, the OB and the OM behaviors can be controlled based on the effect of quantum coherence.