Wang Binbin, Blaize Sylvain, Kim Sera, Yang Heejun, Salas-Montiel Rafael
Appl Opt. 2019 Sep 20;58(27):7503-7509. doi: 10.1364/AO.58.007503.
Surface plasmon polaritons (SPPs) are surface modes confined to metal-dielectric interfaces. This confinement enhances the electromagnetic field and therefore, SPPs are sensitive to surface conditions. The properties of two dimensional materials such as graphene thus can be enhanced and used to engineer nanoscale components for optical communications. However, SPPs are transverse magnetic modes with electric fields out-of-plane that limit flexibility. In this contribution, we numerically analyze the confinement and in-plane enhancement in graphene-based hybrid plasmonic waveguides. We find that plasmonic modes supported by metal nanoparticle chain waveguides provide higher in-plane enhancement compared to those supported by nano-strip and slot hybrid plasmonic waveguides. Our results contribute to the performance improvement of graphene light absorption devices, including electro-optic modulators and photodetectors.
表面等离激元极化激元（SPPs）是局限于金属 - 电介质界面的表面模式。这种局限增强了电磁场，因此，表面等离激元极化激元对表面条件敏感。诸如石墨烯之类的二维材料的特性因而可以得到增强，并用于设计用于光通信的纳米级组件。然而，表面等离激元极化激元是横向磁模式，其电场垂直于平面，这限制了灵活性。在本论文中，我们对基于石墨烯的混合等离子体波导中的局限和平面内增强进行了数值分析。我们发现，与纳米带和狭缝混合等离子体波导所支持的模式相比，金属纳米颗粒链波导所支持的等离子体模式提供了更高的平面内增强。我们的结果有助于包括电光调制器和光电探测器在内的石墨烯光吸收器件的性能提升。
