含负折射率材料的一维“啁啾”光子晶体的透射谱

将"啁啾"函数引入到含负折射率材料的一维光子晶体中,利用转移矩阵法对这种光子晶体的透射谱进行了研究。通过计算模拟了这种光子晶体的透射谱随入射角、频率的变化关系,并计算了这种晶体的复有效折射率的表达式。结果表明,当"啁啾"函数对厚度调制不大时,该晶体具有很宽的反射带,并且反射带对入射角度反应不敏感,其原因是由于其复有效折射率的实部几乎为0,而虚部较大。利用这一特性可以用来制作高品质的宽带全方位反射镜。

Transmission Spectrum of One-dimensional "Chirped" Photonic Crystals Containing Negative Refraction Materials

The "chirped" function is induced to the one dimensional photonic crystals containing negative index media. The transmission spectrum of this type photonic crystal is investigated using the transfer matrix method. The transmission spectrum, as a function of the incident angle and the frequency, is simulated using computing. The results indicate that this photonic crystal has a wider reflect band which is insensitive to the incident angle when the thickness is not much modulated by the "chirped" function. The reason is that the real part of the complete effective index is almost zero, but the imaginary part is more lager. This special property could be used to make high quality reflection lens with wide band and full incident angle.