The first liquid crystal material has birefraction index approximately equal to one half of that of the second liquid crystal material.

其中，第一液晶材料层双折射率约略等于第二液晶材料层双折射率一半。

Using the characteristic of refractive index are smaller than 1 in the reststrahlen band,we can produce photonic crystal having forbidden band in the middle infrared and far infrared.

由此可材料在剩余射线内折射率小于1特性，们可以制备出中红外区和远红外区存在光子晶体。

Incorporating array of metallic wires into the host media, such as ferrimagnet YIG under an external magnetic bias field, is a novel method to synthesize negative refractive index (NRI) material.

摘要以亚铁磁煤质-YIG为基体，在其中嵌入金属导体线阵列是人工合成负折射率微波媒质一种新方法。