在传统脊状等离子体波导的基础上设计了一种带有增益介质层的新型混合脊状等离子体波导, 其结构中的介质层部分包含两个区域: 前区为单一介质, 后区的脊是由2种介质构成的双层脊区。采用二维时域有限差分方法分析了波导结构的传输特性, 得到了TM模下的电场分布图, 并对输出功率以及传输损耗与结构参数和介质折射率的变化规律进行了讨论。结果表明, 在波导中引入的增益介质材料磷化铟后其损耗达到-6 dB/μm。此种波导结构对于光集成芯片的研究与制作具有重要意义。

A novel hybrid ridge plasmonic waveguide with a gain medium layer is presented based on the traditional ridge waveguide. Dielectric layer in the hybrid ridge plasmonic waveguide contains two parts: the first part is a single dielectric area and the second part is a double-layers ridge area containing two kinds of dielectric. The 2D-FDTD method is used to analyze transmission characteristics of the waveguide structure. The electric field distribution of TM mode is given. The dependence of output power and transmission loss on structural parameters and refractive index are discussed. The results show that the transmission loss is up to with the help of the gain medium. The waveguide structure can be applied to the research and fabrication of optical integrated chip.