科研之友
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摘要
Dual bands of left-handedness are obtained in a quasi four-level atomic system. In our system, multichannel quantum interference plays a very important role on the realization of dual bands. It is shown that the permeability can realize negative values in dual bands of this four-level atomic system. Moreover, the permittivity and permeability can simultaneously realize negative values in the same frequency band. It can be found that the atomic system exhibits negative refraction with low absorption in each left-handed frequency band. At some certain frequencies, this left-handed atomic system can obtain zero absorption.
- 出版日期2013-9-1
- 单位哈尔滨工业大学
