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

doi:10.1088/1674-1056/19/1/014211

Abstract 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 enhanceingthe imaging resolution in realizing `superlenses'.

Keywords: zero absorption left-handedness negative refractive index negative permittivity and permeability

Received: 19 May 2009
Revised: 25 June 2009
Accepted manuscript online:

PACS:	32.80.-t	(Photoionization and excitation)
	31.15.-p	(Calculations and mathematical techniques in atomic and molecular physics)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 60768001 and 10464002).

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Zhao Shun-Cai(赵顺才), Liu Zheng-Dong(刘正东), and Wu Qi-Xuan(吴奇宣) Left-handedness without absorption in the four-level Y-type atomic medium 2010 Chin. Phys. B 19 014211

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

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