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

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

中国物理B ›› 2010, Vol. 19 ›› Issue (1): 14211-014211.doi: 10.1088/1674-1056/19/1/014211

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

吴奇宣¹, 赵顺才², 刘正东²

(1)College English department, Hainan University, Danzhou 571737, China; (2)School of Materials Science and Engineering, Nanchang University, Nanchang 330031, China; Engineering Research Center for Nanotechnology,Nanchang University, Nanchang 330047, China; Institute of Modern Physics, Nanchang University, Nanchang 330031, China

收稿日期:2009-05-19 修回日期:2009-06-25 出版日期:2010-01-15 发布日期:2010-01-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 60768001 and 10464002).

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

Zhao Shun-Cai(赵顺才)^a), Liu Zheng-Dong(刘正东)^a)^†, and Wu Qi-Xuan(吴奇宣)^b)

^a School of Materials Science and Engineering, Nanchang University, Nanchang 330031, China; Engineering Research Center for Nanotechnology, Nanchang University, Nanchang 330047, China; Institute of Modern Physics, Nanchang University, Nanchang 330031, China; ^b College English department, Hainan University, Danzhou 571737, China

Received:2009-05-19 Revised:2009-06-25 Online:2010-01-15 Published:2010-01-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 60768001 and 10464002).

摘要/Abstract

摘要： 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'.

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'.

Key words: zero absorption, left-handedness, negative refractive index, negative permittivity and permeability

中图分类号: (Photoionization and excitation)

32.80.-t

31.15.-p (Calculations and mathematical techniques in atomic and molecular physics)

赵顺才, 刘正东, 吴奇宣. Left-handedness without absorption in the four-level Y-type atomic medium[J]. 中国物理B, 2010, 19(1): 14211-014211.

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[J]. Chin. Phys. B, 2010, 19(1): 14211-014211.

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

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

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