Phase Manipulating Refractive Index form Positive to Negative in a Four-level Atomic System

Hongjun Zhang, Yueping Niu, Shangqing Gong

Shun‐Cai Zhao, Qixuan Wu, Ailing Gong

Hamid Reza Hamedi, Gediminas Juzeliūnas, Ali Raheli +1 more

张红军, 钮月萍, 龚尚庆

We propose a scheme for realizing negative refractive index in a V-type four-level atomic system. It is shown that the negative refractive index can be achieved in a wide frequency band based on the effect of quantum coherence. It is also found that the frequency band of negative refractive index and the absorption property of left-handed material are manipulated by the pump and control fields. Furthermore, left-handed material with reduced absorption is possible by choosing appropriate parameters. (c) 2006 Elsevier B.V. All rights reserved.

Zach J. Simmons, N. R. Brewer, Deniz D. Yavuz

Hongju Guo Hongju Guo, Hongjun Zhang Hongjun Zhang, Chunfang Wang Chunfang Wang +1 more

Multicolor manipulation of negative refraction in a three-level Λ atomic system is theoretically investigated.Based on multicolor coherence, the negative refractive index can be obtained with reduced absorption.The refractive index can also be controlled by changing the sum of the phases of the sidebands in the trichromatic driving fields.By adjusting the sum phase, the refractive index can be varied between negative and positive in two different frequency bands.Furthermore, the frequency band corresponding to the negative refractive index is widened by increasing the intensity and the frequency difference of the trichromatic field.