Negative refraction without absorption via both coherent and incoherent fields in a four-level left-handed atomic system |
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Authors: | Shun-Cai Zhao Zheng-Dong Liu Qi-Xuan Wu |
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Institution: | a School of Materials Science and Engineering, Nanchang University, Nanchang 330031, PR China b Engineering Research Center for Nanotechnology, Nanchang University, Nanchang 330047, PR China c Institute of Modern Physics, Nanchang University, Nanchang 330031, PR China d College English Department, Hainan University, Danzhou 571737, PR China |
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Abstract: | This paper attempts a probe into negative refraction without absorption by means of an incoherent pump field and a strong coherent field coupling the dense four-level atomic system. With the application of the incoherent pump field to manipulate the populations in atomic levels and the variable strong coherent field to create quantum coherence, the constraint condition of two equal transition frequencies responding to the probe field in the atomic system isn't required. And these lead to the propagation transparency and strong magnetic response of the probe field, left-handedness with vanishing absorption in the atomic system. However, an excessive coherent field intensity would increase the absorption. |
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Keywords: | Negative refraction Without absorption Coherent field Incoherent field |
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