超材料啁啾周期结构中的光束振荡和卷曲
Beam oscillations and curling in chirped periodic structures with metamaterials
摘要：
研究了在平均折射率为零的情况下，电磁波在由负折射率（或左手）超材料和常规介质交替层组成的一维啁啾周期结构中的传播.我们考虑的情况下，当周期性结构有一个线性啁啾，啁啾是通过线性变化的层的厚度在整个结构。我们应用渐近分析方法分析布洛赫振荡，发现，在一个鲜明的对比，普通的周期性介质结构，在多层堆叠的超材料的能量流可能有相反的方向在带边，从而提供了新的可能性，在传输带的波束转向。
英文摘要：
We study the propagation of electromagnetic waves in one-dimensional chirped periodic structures composed of alternating layers of negative-index (or left-handed) metamaterial and conventional dielectric, under the condition of the zero average refractive index. We consider the case when the periodic structure has a linear chirp, and the chirp is introduced by varying linearly the thickness of the layers across the structure. We apply an asymptotic analytical method for the analysis of the Bloch oscillations and find that, in a sharp contrast to ordinary periodic dielectric structures, the energy flow in multi-layered stacks with metamaterials may have the opposite direction at the band edges, thus providing novel possibilities for the beam steering in the transmission band.
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