Left-handedness without absorption in the four-level Y-type atomic medium

In this paper we have investigated three external fields interacting with the four-level Y-type atomic system described by the density-matrix approach. The results show that left-handedness with zero absorption is achieved. The zero absorption property displays the possibility of manipulation by var...

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Bibliographic Details
Published in:Chinese physics B 2010, Vol.19 (1), p.350-354
Main Author: 赵顺才 刘正东 吴奇宣
Format: Article
Language:English
Subjects:
Amplification
Displays
Evanescent waves
Imaging
Joining
Lenses
Yttrium
原子介质
原子系统
吸收特性
密度矩阵方法
成像分辨率
相互作用
耦合强度
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Summary:In this paper we have investigated three external fields interacting with the four-level Y-type atomic system described by the density-matrix approach. The results show that left-handedness with zero absorption is achieved. The zero absorption property displays the possibility of manipulation by varying the phase and the intensity of the coupling field. Also, the zero absorption property may be used to amplify the evanescent waves that have been lost in imaging by traditional lenses. We propose an approach to obtain a negative refractive medium with zero absorption and the possibility of enhaneeingthe imaging resolution in realizing ＇superlenses＇.
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/19/1/014211