中文摘要：

利用双光子聚合加工技术在低折射率材料中制备了具有宽带隙的光子晶体结构，通过递推方式获得晶格常数的最佳变化条件。通过透射及反射谱测量及时域有限差分方法证实了周期渐变的准金刚石结构的带隙展宽现象，该结果表明三维光子晶体带隙展宽可由不同晶格常数的结构叠加形成。

英文摘要：

Wide Photonic Band Gaps （PBG） with low refractive index materials were fabricated using two-photon nanofabrication technique. The fittest lattice change condition was deduced by a simple method. The PBG of the gradient quasi-diamond lattices was experimentally confirmed by reflection and transmission measurements and simulation of Finite Difference Time Domain （FDTD） calcula- tions. The results indicate that a three dimensional photonic crystals with gradient lattices could effec- tively expand the width of the PBG.