Phase control of switching from positive to negative index material in a four-level atomic system
Data(s) |
2008
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Resumo |
Electric and magnetic responses of the medium to the probe field are analysed in a four-level loop atomic system by taking into account the relative phase of the applied fields. An interesting phenomenon is found: under suitable conditions, a change of the refractive index from positive to negative can occur by modulating the relative phase of the applied fields. Then the medium can be switched from a positive index material to a negative index material in our scheme. In addition, a negative index material can be realized in different frequency regions by adjusting the relative phase. It may give us a convenient way to obtain the desired material with positive or negative index. |
Identificador | |
Idioma(s) |
英语 |
Fonte |
张红军;钮月萍;孙辉;Luo Jian;龚尚庆 .,J. Phys. B-At. Mol. Opt. Phys.,2008,41(12):125503- |
Palavras-Chave | #激光技术;激光物理与基本理论 #Applied fields #Atomic systems #Different frequencies #Four-level atomic systems #Magnetic responses #Negative index material (NIM) #Negative-index #Positive index material (PM) #Probe fields |
Tipo |
期刊论文 |