In this research, by using the theory of the surface plasmon polaritons and the plasmonic hybrid components, a new symmetric three-core hybrid plasmonic splitter is proposed at the communication wavelength range. The design consists of two silicon external waveguides with the same dimensions and features, and a centered hybrid waveguide. The centered hybrid waveguide simulated with two silver metal layers and a core silicon waveguide. The plasmonic hybrid coupler supports three supermodes and directly couples the transverse magnetic (TM) mode to the second external waveguide. In contrast, the transverse electric (TE) mode passes through the first external waveguide without coupling. The essential features of the proposed design were studied thoroughly. The most significant parameters of the structure, including propagated modes in the waveguides, extinction ratio (ER), insertion loss (IL), and power transfers, were evaluated using the finite-difference eigenmode (FDE) and eigenmode expansion (EME) methods. The results show that the ERs for the external waveguides are greater than 38 dB for the first external waveguide and 40 dB for the second external waveguide. The ILs of the TE and TM modes are less than 0.1 dB and 0.5 dB at the 1550 nm telecommunication wavelength, respectively.

在这项研究中，利用表面等离激元极化子和等离激元混合成分的理论，提出了一种在通信波长范围内的新型对称三芯混合等离激元分裂器。该设计由两个具有相同尺寸和特征的硅外部波导和一个中心混合波导组成。用两个银金属层和一个芯硅波导模拟了中心混合波导。等离子体混合耦合器支持三种超模式，并将横向磁（TM）模式直接耦合到第二个外部波导。相反，横向电（TE）模式不耦合地通过第一外部波导。对该设计的基本特征进行了深入研究。结构的最重要参数，包括波导中的传播模式，消光比（ER），插入损耗（IL）和功率传输是使用有限差分本征模（FDE）和本征模展开（EME）方法进行评估的。结果表明，第一外部波导的外部波导的ER大于38 dB，第二外部波导的ER大于40 dB。在1550 nm电信波长下，TE和TM模式的IL分别小于0.1 dB和0.5 dB。