A novel design of elliptic cylindrical nanowire hybrid plasmonic waveguide (ECNHPW)–based polarization beam splitter (PBS) is proposed. In the proposed design, the ECNHPW arm acts as an input port and a bar port; on the other hand, a regular silicon wire (RSW) arm acts as a cross port. By selecting the physical parameters of the proposed PBS accurately, the transverse electric (TE) mode is merely satisfied with the phase-matching condition. In contrast, the transverse magnetic (TM) mode does not propagate to the RSW arm. Consequently, the TM input mode goes directly to the ECNHPW arm, while the TE input mode in ECNHPW is coupled with RSW arm. As a result, the two different polarization modes are meritoriously separated, and they pass through two different arms. For the proposed PBS, the insertion loss (IL) of both polarizations lies below 1 dB. For TE input, the value of the polarization extinction ratio (PER) is 27.2 dB, and for TM input, it is 23.9 dB at 1550 nm operating wavelength. Further optimization is implemented by varying the wavelength, thickness of SiO₂, and the gap between the waveguides using the finite element method (FEM). The proposed PBS is designed with 150 nm bandwidth, high PER, and low IL, which can be suitable for photonic integrated circuits (PICs).

提出了一种基于椭圆圆柱纳米线混合等离子体激元波导（ECNHPW）的偏振分束器（PBS）的新颖设计。在建议的设计中，ECNHPW臂充当输入端口和条形端口；另一方面，常规硅线（RSW）臂用作交叉端口。通过精确地选择所提出的PBS的物理参数，仅满足相位匹配条件即可满足横向电（TE）模式。相反，横向磁（TM）模式不会传播到RSW臂。因此，TM输入模式直接进入ECNHPW臂，而ECNHPW中的TE输入模式与RSW臂耦合。结果，两个不同的偏振模被很好地分开，并且它们通过两个不同的臂。对于建议的PBS，两种极化的插入损耗（IL）均低于1 dB。对于TE输入，偏振消光比（PER）的值为27.2 dB，对于TM输入，在1550 nm工作波长下为23.9 dB。通过改变SiO的波长，厚度来实现进一步的优化使用有限元方法（FEM）可以看到图_2所示的波导之间的间隙。拟议中的PBS设计具有150 nm带宽，高PER和低IL，可适用于光子集成电路（PIC）。