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平均折射率为零的光子晶体中缺陷模频率特性的实验研究
Frequency properties of the defect mode inside a photonic crystal band-gap with zero average refractive index
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摘要: 利用传输线技术制备了左手材料,将左手材料与正常材料交替排列组合成平均折射率为零的一维光子晶体.该光子晶体在特定频段具有光子带隙,带隙不随晶格尺度和入射角的变化而改变.通过掺杂技术破坏光子晶体的周期性,可在禁带中引入缺陷模,这种结构的光子晶体可用于实现滤波器小型化和超强耦合.研究表明,通过调节缺陷的厚度可以控制缺陷模的频率,这为调节频率提供了一种方法.实验与仿真结果相符.Abstract: Left-handed metamaterial has been designed based on transmission line technology.A left-handed and a normal materials are studied alternately to form a one-dimensional photonic crystal with an average refractive index of zero but a special band-gap emerges.The two band-edge frequencies of this gap are insensitive to the incident angle and lattice constant.These characteristics can be used in theminiaturization of filters and high-quality coupling.Studies show that we can regulate the mode frequency by controlling the thickness of the defect layer,which can provide a method for the adjusting frequency in applications.The experimental results are consistent with numerical simulation.
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