摘要
利用传输矩阵法,讨论了由单负材料组成的光子晶体的偏振特性。结果表明:垂直入射时,TE模和TM模的透射谱完全相同。当入射角θ增加时,两模的透射谱均向短波方向移动,禁带的宽度增加,且TE模的变化大于TM模的。入射角越大,变化越明显。光子晶体的周期数N增加时,准禁带底部逐步降低,宽度稍有变窄,禁带的位置和宽度均保持不变。但位于两禁带间通带顶部震荡峰的数量M增加,且M和N之间满足M=N-1。介质的几何厚度增加时,TE模和TM模的透射谱均向长波方向移动,禁带的宽度增加,反之亦然。当介质的几何厚度的变化量相同,两模透射谱禁带宽度的变化量也分别相同。
The polarization properties of photonic crystals containing single-negative materials were discussed by transfer matrix method,the results indicate that at the normal incidence,the transmission spectra of TE and TM modes are identical. With the increase of incident angle 0, the transmission spectra of the two modes move towards short-wave di- rection together with the forbidden band width increase, and the change of TE modes is greater than TM ones. The greater the incidence angle is, the more obvious this change will be. The bottoms of the quasi-forbidden band reduce gradually and the width is narrower slightly;the positions and width of forbidden band remain unchanged when number of period N increases. Whereas, the number of oscillation peaks M located at the top pass-band between the two bands will increase, and M and N obey the formulae M = N - 1. The transmission spectra of TE and TM modes move towards long-wave direction together with the forbidden band width increasing. The same results can be observed when geomet- ric thickness of the medium increases. The geometry thicknesses of the medium variation are same, the variation of the forbidden band width of the transmission spectrum of these two modes were also same, respectively.
出处
《激光与红外》
CAS
CSCD
北大核心
2011年第2期216-219,共4页
Laser & Infrared
关键词
光子晶体
单负材料
透射谱
偏振特性
photonic crystal
single-negative materials
transmission spectra
polarization properties
