Apodized grating coupler using fully-etched nanostructures
Apodized grating coupler using fully-etched nanostructures
复制标题
使用全蚀刻纳米结构的变迹光栅耦合器
DOI：
10.1088/1674-1056/25/8/084212
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发表时间：
2016
影响因子：
1.7
通讯作者：
Guo Xia
中科院分区：
文献类型：
--
作者：
Wu Hua;Li Chong;Li Zhi-Yong;Guo Xia
为了弥合光栅耦合器与光纤之间的模式间隙，提出了一种用于单模光纤与光子电路接口的二维切趾光栅耦合器。光栅耦合器的光栅槽由完全蚀刻的纳米结构的列实现，其用于数字地定制每个槽的有效折射率，以获得类高斯输出衍射模式，从而提高耦合效率。与均匀光栅耦合器相比，采用纳米孔和纳米矩形作为折射率调谐层的变迹光栅耦合器的耦合效率分别提高了4.3%和5.7%.
A two-dimensional apodized grating coupler for interfacing between single-mode fiber and photonic circuit is demonstrated in order to bridge the mode gap between the grating coupler and optical fiber. The grating grooves of the grating couplers are realized by columns of fully etched nanostructures, which are utilized to digitally tailor the effective refractive index of each groove in order to obtain the Gaussian-like output diffractive mode and then enhance the coupling efficiency. Compared with that of the uniform grating coupler, the coupling efficiency of the apodized grating coupler is increased by 4.3% and 5.7%, respectively, for the nanoholes and nanorectangles as refractive index tunes layer.