通过向SiO2 Opal模板中填充钛酸乙酯制备TiO2光子晶体，观测到光子晶体带隙位置的移动达62 nm，并发现光子晶体的有序度随填充率的升高而下降。向聚苯乙烯Opal模板中填充钛酸乙酯，制备成当时填充率最高、带隙最短的紫外波段TiO2反Opal光子晶体 (中心波长~380 nm)，并根据测量的其透射谱估算出其填充率约为12%，即Opal模板孔隙的50%被填充。本文还对二维 PPLN光子晶体进行了研究。建立了一套高压极化装置和电压数据采集装置，通过外加电场极化法成功制备出了具有正方形和矩形两种晶格形状二维 PPLN光子晶体。利用二维PPLN的二阶准相位匹配，测量了其对1.064 mm激光的二次谐波转换效率，并研究了晶体的温度、激光的入射角度及占空比对二次谐波转换效率的影响。利用矩形晶格实现了多方向、多波长倍频高效输出。

In this paper, we report some results on inverse opal photonic crystal and two-dimensional periodically poled lithium niobate photonic crystal. At first the process of infiltrating TiO2 into SiO2 Opal was systematically studied. Because of the infiltration of TiO2 the gap of SiO2 Opal was shifted to longer wavelength and a maximum shift of 62 nm was observed. Furthermore, an inverse TiO2 Opal with larger filling fraction, ~ 12%, was fabricated, whose band gap in the G-L direction located in the ultraviolet region (~380 nm). Then two-dimensional nonlinear photonic crystals of lithium niobate with uniform square lattices were fabricated by applying external electric field. The variations of second-harmonic output with crystal temperature, incident angle and reversed duty cycle were measured. Red, yellow, green, blue, and violet coherent radiations were generated in the nonlinear photonic crystal with rectangular lattice in the collinearly and non-collinearly quasi-phase matching geometries. The results showed that two-dimensional nonlinear photonic crystal could be used to generate various colors simultaneously and efficiently along different directions.