波在不同色散特异介质一维光子晶体中的传播

Wave Propagation in a One-dimensional Photonic Crystal with Different Dispersive Metamaterial

对由两种不同色散模型的负折射特异介质构成的光子晶体,利用传输矩阵法研究了微波段的电磁波在其中传播特性。两种特异介质均为双负,TE波和TM波以相同的角度入射,有相同的带隙结构,且带隙结构对入射角不敏感。其中一种特异介质为电单负,而另一种特异介质为双负时,光子带隙对TE波的禁带随入射角的增大而展宽;而当入射角大于0.5rad,TM波的禁带不再改变。结果表明,该结构的光子晶体带隙在某些频率内具有全向反射特性。

Photonic crystal is composed with two different dispersive metamaterials-negative refractive index materials.Transmission spectra are obtained by transfer matrix in microwave region.When two materials all are double negative,band structure is the same for TE and TM wave at the same incident angle,which is insensitive to the incident angle.For the one with negative permittivity and positive permeability and another with the double negative,Band-gap gets wide as the incident angle increases for TE wave.However,band gap remains when the incident angle is larger than 0.5 rad for TM wave.According to the results,band-gap of this photonic crystal can be act as omnidirectional reflector.