Photonic crystal heterostructures fabricated by TiO2 and ZnO inverse opals using colloidal crystal template with single kind of microspheres
Photonic crystal heterostructures fabricated by TiO2 and ZnO inverse opals using colloidal crystal template with single kind of microspheres
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DOI：
10.1016/j.optmat.2012.04.014
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发表时间：
2012-09
影响因子：
3.9
通讯作者：
Yongna Zhang;M. Fu;Jigang Wang;D. He;Yongsheng Wang
中科院分区：
文献类型：
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作者：
Yongna Zhang;M. Fu;Jigang Wang;D. He;Yongsheng Wang
光子晶体异质结构的制备在集成光子晶体芯片、多频光学布拉格滤波器或反射镜等领域具有重要的应用价值。然而，在光子晶体异质结构的制备中，微球的自组装过程通常是多步进行的，这可能会产生胶体晶体的晶格失配。因此，本文研究了利用胶体晶体模板和单一微球制备光子晶体异质结构。首先由单分散的聚苯乙烯微球形成周期性均匀的胶体晶体模板。然后将ZnO电沉积到模板的空隙中。通过改变沉积时间将ZnO的厚度控制为小于模板的厚度。将TiO 2前驱体填充到模板的顶部空隙后，去除聚苯乙烯胶体晶体模板，形成ZnO和TiO 2的光子晶体异质结构。由于溶胶-凝胶过程的收缩，异质结构的两部分的介电常数和周期性都不同。ZnO/TiO 2异质结构具有较宽的光子阻带，是ZnO反蛋白石和TiO 2反蛋白石光子阻带的叠加。
The fabrication of photonic crystal heterostructures is important for the applications in the fields of integrated photonic crystal chips, multi-frequency optical Bragg filters or mirrors. However, multiple steps of self-assembly process of microspheres are always employed in the fabrication of photonic crystal heterostructures, which may produce lattice mismatches of colloidal crystals. Therefore, photonic crystal heterostructures fabricated by using colloidal crystal template with single kind of microspheres were investigated in this paper. A colloidal crystal template with uniform periodicity was firstly formed by monodispersed polystyrene microsphere. Then ZnO was electrodeposited into the interstices of the template. The thickness of ZnO was controlled to be less than the thickness of the template by varying the deposition time. After the TiO2precursor was filled into the top voids in the template, the polystyrene colloidal crystal template was removed and photonic crystal heterostructures fabricated by ZnO and TiO2were formed. Both the dielectric constant and the periodicity of the two parts of the heterostructures are different due to the shrinkage of the sol–gel process. The ZnO/TiO2heterostructures have a broad photonic stop band which is the superposition of photonic stop bands of ZnO inverse opals and TiO2inverse opals.