A Branch-Type TE/TM Wave Splitter Using a Light-Guiding Metal Line
A Branch-Type TE/TM Wave Splitter Using a Light-Guiding Metal Line
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DOI：
10.1109/jlt.2006.889656
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发表时间：
2007-03
影响因子：
4.7
通讯作者：
T. Yamazaki;J. Yamauchi;H. Nakano
中科院分区：
文献类型：
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作者：
T. Yamazaki;J. Yamauchi;H. Nakano
将三维波束传播方法应用于一种新型的横向电/横向磁（TE/TM）分波器的分析，该分波器采用导光金属（Ag）线和内嵌介质（SiO2）波导。在分析分路器之前，设计了一种带锥形金属的模式转换器，用于将嵌入式波导的引导模式平滑地转换为表面等离子体-极化子（SPP）模式，反之亦然。在演示了由两步线性锥度组成的变换器的有效性之后，对分路器的性能进行了评估。为了获得较高的耦合效率，补偿了SPP模式的波前失配。此外，在TE输出波导中增加了TE通偏光镜，减少了不需要的TM波。与传统分支型分频器的长器件长度（bbb1000毫微米）相比，目前的分频器的器件长度明显短，小于200毫微米，尽管在TM波中观察到约3db的损耗。在1.31和1.55 μ m波长下，当分支角为16±2°时，串扰和消光比分别小于-15 dB和大于15 dB
The three-dimensional (3-D) beam-propagation method is applied to the analysis of a novel transverse electric/transverse magnetic (TE/TM) wave splitter using a light-guiding metal (Ag) line with an embedded dielectric (SiO2) waveguide. Before analyzing the splitter, a mode converter with a tapered metal is designed to smoothly convert the guided mode of an embedded waveguide into the surface plasmon-polariton (SPP) mode, and vice versa. After demonstrating the effectiveness of a converter consisting of a two-step linear taper, the performance of the splitter is evaluated. To obtain a high coupling efficiency, the wavefront mismatch of the SPP mode is compensated for. In addition, a TE-pass polarizer is added to the TE output waveguide, reducing the undesirable TM wave. In contrast to the long device length of a conventional branch-type splitter (>1000 mum), the present splitter is found to have a noticeably short device length of less than 200 mum, although a loss of about 3 dB is observed for the TM wave. The crosstalk and the extinction ratio are, respectively, evaluated to be less than -15 dB and more than 15 dB for a branching angle of 16plusmn2deg at wavelengths of 1.31 and 1.55 mum