SiO_2/ZnO三维光子晶体的制备及光学性质

Fabrication and Optical Properties of SiO_2/ZnO Three-dimensional Photonic Crystals

采用垂直沉积法制备了三维SiO2光子晶体模板。以醋酸锌为前躯体,成功制备了SiO2/ZnO三维复合光子晶体。扫描电子显微镜测试结果表明SiO2和SiO2/ZnO光子晶体均为面心立方结构排列。光学测试表明SiO2和SiO2/ZnO周期性阵列均在[111]方向出现了光子带隙。当具有较高折射率的ZnO材料包覆后,SiO2/ZnO光子晶体[111]方向光子带隙的中心波长发生红移,光子晶体基元材料的有效折射率有所增加。同时,光子晶体的光学性质与样品内部的缺陷态密度密切相关。

Three-dimensional SiO2 photonic crystals template was fabricated by vertical deposition method. SiO2/ZnO three-dimensional composite photonic crystals were successfully synthesized using zinc acetate as a precursor material. Scanning electron microscopy （SEM） measurements show that SiO2 and SiO2/ZnO photonic crystals are arranged in a face-center-face （FCC） way. Optical measurement reveals that the periodic arrays exhibit a photonic band gap in the [111] direction. The results show that the center wavelength of [111] photonic band gap shows a red shift and the effective refractive index of photonic crystals can be increased when ZnO （higher refractive index） material coated. Moreover,the optical properties of photonic crystals strongly depend on the density of intrinsic defects in the samples.