Compact polarization rotator based on slotted optical waveguide with buffer layer using surface plasmon polariton
Compact polarization rotator based on slotted optical waveguide with buffer layer using surface plasmon polariton
复制标题
DOI：
10.1117/12.2005135
复制
发表时间：
2013-03
期刊：
影响因子：
--
通讯作者：
H. Kim;Tae-Kyeong Lee;G. Oh;Byeong-Hyeon Lee;Doo-Gun Kim;Young-Wan Choi
中科院分区：
文献类型：
--
作者：
H. Kim;Tae-Kyeong Lee;G. Oh;Byeong-Hyeon Lee;Doo-Gun Kim;Young-Wan Choi
首次提出并分析了一种新型的基于等离子体的非对称光波导偏振旋转器。采用3D-FDTD方法设计了金属薄膜缝隙光波导(SOW)偏振旋转器。由于金属薄膜的等离子体特性可以通过金属包层光波导导出慢的群速度，所以在波导上的金属薄膜起到了快速旋转光偏振的作用。在这里，提出了一种带有缓冲层的光波导来降低传输损耗。6μm的偏振旋转器是波导型偏振旋转器中报道的最短的旋转器之一。在1550 nm附近观察到了98.93%的偏振转换效率，传输损耗为-0.43分贝。该结构比已有的非对称光波导偏振旋转器更小，更能有效地利用等离子体效应来控制偏振。
A novel polarization rotator with asymmetric optical waveguide based on plasmonics is proposed and analyzed for the first time. The polarization rotator using skewing effects at the slotted optical waveguide (SOW) with metal film was designed by 3D-FDTD method. A metal film on the waveguide acts to rapidly rotate the optical polarization, because the plasmonic characteristics of a metal film can induce the slow group velocity through the metal-clad optical waveguide. Here, the optical waveguide with a buffer layer is proposed to reduce the propagation loss. The polarization rotator length of 6 μm is among the shortest reported in the waveguide-type polarization rotators. The polarization conversion efficiency of 98.93 % is observed near 1550 nm along with a propagation loss of -0.43 dB. The proposed structure is smaller than previous polarization rotator with asymmetric optical waveguide and is more effective to control polarizations using by plasmonic effects.