Photonic band gap from a stack of single-negative materials
Photonic band gap from a stack of single-negative materials
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DOI：
10.1016/j.jmmm.2005.07.010
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发表时间：
2006-06
影响因子：
2.7
通讯作者：
Lei Gao;Chaojun Tang;Shuming Wang
中科院分区：
文献类型：
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作者：
Lei Gao;Chaojun Tang;Shuming Wang
我们研究了由交替介电常数负材料层和负磁导率材料层组成的多层结构的传输间隙。研究发现，无论是法向入射还是斜入射，都存在传输间隙，该传输间隙不随尺度长度的变化而变化。鉴于层在电学上很薄的事实，引入有效介电常数εeff和磁导率μefffare来研究电磁波的传输特性。数值结果表明，传输间隙可以用全反射很好地解释（ɛeffμeff-ɛairμairsin2θ<0，其中θ为入射角）。有趣的是，间隙的边缘可以通过 ɛeffμeff-ɛairμairsin2θ=0 精确确定。此外，我们还表明零有效相移间隙（zero-φeffgap）和零体积平均折射率间隙（zero-n¯间隙）也可以用类似的方式理解。
We investigate the transmission gap of the multilayer structure consisting of alternate permittivity-negative material layer and permeability-negative material layer. It is found that for both normal and oblique incidences, there exists a transmission gap which is invariant with a change of scale length. In view of the fact that the layers are electrically thin, the effective permittivity ɛeffand permeability μeffare introduced to study the transmission property of electromagnetic waves. Numerical results show that the transmission gap can be well explained by the total reflection (ɛeffμeff-ɛairμairsin2θ<0, where θ is the incident angle). To one's interest, the edges of the gap can be accurately determined by ɛeffμeff-ɛairμairsin2θ=0. In addition, we show that zero effective phase shift gap (zero-φeffgap) and zero volume averaged refractive index gap (zero-n¯ gap) can also be understood in a similar way.