Broadband and High Extinction Ratio Mode Converter Using the Tapered Hybrid Plasmonic Waveguide
Broadband and High Extinction Ratio Mode Converter Using the Tapered Hybrid Plasmonic Waveguide
复制标题
使用锥形混合等离子体波导的宽带和高消光比模式转换器
DOI：
10.1109/jphot.2019.2919588
复制
发表时间：
2019-06-01
影响因子：
2.4
通讯作者：
Ren, Xiaomin
中科院分区：
文献类型：
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作者：
Cheng, Zhuo;Wang, Jun;Ren, Xiaomin
为了实现基频横电模（TE0）和一阶横磁模（TM1）之间的模式转换，提出了一种宽带高消光比模式转换器，并对其进行了数值分析。该模式变换器采用将金属直接覆盖在硅波导上的锥形混合等离子体波导来实现，而不需要薄的低折射率层。对锥形混合等离子体波导结构进行优化后，获得了100 nm的宽工作带宽，且输出Si波导中TM1模式和TE0模式的消光比大于20 dB，用于正向传播。对于反向传播，输出Si波导的消光比大于20 dB，获得了65 nm以上的工作带宽。模变换器的总占地面积仅为0.8 × 11 μm2。对制造公差进行了分析。
We propose and numerically analyze a broadband and high extinction ratio mode converter to achieve the mode conversion between the fundamental transverse electric mode (TE0) and the first-order transverse magnetic mode (TM1). The mode converter is achieved by using the tapered hybrid plasmonic waveguide which the metal is directly covered on the Si waveguide without a thin low-index layer. After optimizing the structure of the tapered hybrid plasmonic waveguide, a wide operation bandwidth of 100 nm is obtained with the extinction ratio of the TM1 mode and TE0 mode larger than 20 dB in the output Si waveguide for the forward propagation. And for the back propagation, the operation bandwidth over 65 nm is obtained with the extinction ratio larger than 20 dB in the output Si waveguide. The whole footprint of the mode converter is only 0.8 × 11 μm2. Fabrication tolerance analysis is also demonstrated.