光学学报, 2015, 35 (11): 1113002, 网络出版: 2015-10-15
与聚合物光波导混合集成的薄膜偏振分束器
Polarization-Beam Splitter based on Thin-Film Element Hybridly Integrated in Polymer Waveguide
摘要
基于光学薄膜的偏振效应和多光束干涉效应设计了由多层二氧化钛(TiO2)-二氧化硅(SiO2)薄膜结构组成的偏振分束片,提出了在聚合物光波导中混合集成的方案,并采用时域有限差分(FDTD)数值法优化了方案中的结构设计。在聚合物材料基底上制备了TiO2-SiO2 多层薄膜偏振分束片,并将此薄膜偏振分束片嵌入聚合物光波导的沟槽中,从而实现了结构紧凑的偏振分束器。而后对此混合集成偏振分束器进行了实验表征,实验表明该器件在C波段上的插入损耗低于2.5 dB,偏振消光比大于25 dB。这样混合集成的偏振分束器不仅可用于现有的偏振控制光学系统中,而且充分发挥了薄膜偏振分束片的优势,可为实现小型化、高度集成的偏振分束器提供新方案和更多的自由度。
Abstract
Based on the polarization effects and multiple- beam interference effects of optical thin films, a polarization beam splitter (PBS) consisting of multiple TiO2-SiO2 thin film layers is designed, then the hybridintegration scheme within an optical waveguide is proposed and the integration structure is optimized with finite- different time- domain (FDTD) numerical method. The hybrid integration is realized as follows. The multiple TiO2- SiO2 thin film layers are deposited on a substrate made of polymer material, while a slot is fabricated in the polymer waveguide. The thin film element is then inserted in this slot to assemble a compact and hybridly integrated PBS. This hybrid integrated PBS is also characterized experimentally. The results show that, in the C-band (1530 nm to 1565 nm), the device insertion loss is smaller than 2.5 dB, and the polarization splitting ratio is higher than 25 dB. Such a hybridly integrated PBS can be used in present polarization-control optical systems. It also exploits the advantages of the thin film polarization element, thus provides novel schemes and more degrees of freedom, to realize miniaturized and densely integrated PBS.
翟羽萌, 王瑾, 陆云清, 许吉, 付旭. 与聚合物光波导混合集成的薄膜偏振分束器[J]. 光学学报, 2015, 35(11): 1113002. Zhai Yumeng, Wang Jin, Lu Yunqing, Xu Ji, Fu Xu. Polarization-Beam Splitter based on Thin-Film Element Hybridly Integrated in Polymer Waveguide[J]. Acta Optica Sinica, 2015, 35(11): 1113002.