Power splitters are considered essential components in optical interconnects. In this research work, two different designs of 1×2 3-dB small-footprint high-performance plasmonic power splitters with less than 1% loss in each branch are proposed and numerically investigated using the finite-difference-time-domain method. Based on the simulation results, we show that unequal splitting ratio can be achieved by breaking the symmetry of the two plasmonic branches either by changing the width or the position of one of the splitter branches with respect to the other one. Moreover, the proposed splitters’ designs have the advantage of improving the alignment tolerance of the two plasmonic branches with respect to the centre of the dielectric waveguide in addition to broadening the spectrum response of the splitter. Our proposed technique can be extended to 1×N power splitters in addition to being employed in various high density photonic integration and nano-plasmonic circuits such as directional couplers and Mach–Zehnder interferometers.

功率分配器被认为是光互连中必不可少的组件。在这项研究工作中，提出了两种不同的设计，即每个分支中损耗小于1％的1×2 3 dB小尺寸高性能等离子功率分路器，并使用时域有限差分法进行了数值研究。基于仿真结果，我们表明通过改变一个分支分支相对于另一个分支的宽度或位置，可以通过打破两个等离激元分支的对称性来实现不相等的分裂比率。此外，所提出的分离器的设计除了扩大分离器的频谱响应之外，还具有改善两个等离激元分支相对于介电波导的中心的对准公差的优点。