异质三周期光子晶体的光子带隙特性

利用传输矩阵法研究了由TiO₂和SiO₂两种材料构成的异质三周期一维光子晶体的传光特性,发现该结构能在波长为200~ 2 000 nm的范围内形成7处比较明显的光子带隙,并且波长越大,带隙的宽度越大。重点研究了这种结构的光子晶体的透射谱线与入射角度、介质层数及介质层厚度的关系,发现该结构形成的光子带隙的大小和位置对介质层的循环周期数不敏感,但对入射角度和介质层的厚度很敏感。

Photonic Bandgap Properties of Triply Periodic Photonic Crystal Heterostructures

The optical transmission of one dimensional photonic crystal (PC) containing TiO₂ and SiO₂ material with triply-periodical heterostructures was investigated by transfer matrix method. The results show that there are seven photonic band gap (PBG) in the range of 200~2 000 nm in PC, and the band gap width increases with the wavelength. The authors put emphasis on the relationship between the optical transmissionof this kind PCs and incident angle, layers of dielectric, as well as dielectric layer thickness. It is found that the width and position of band gap are sensitive to incident angle and dielectric layer thickness, but not periodic numbers.