Beam filter and splitter based on surface plasmon propagation in ring metal heterowaveguide

Pramana

Linhua Xu1²  Wei Su¹  Yunyun Chen²  Yuzhu Liu³  Gaige Zheng1 2² 

[1] School of Science, Nanjing University of Science & Technology, Nanjing 210094, China$$;Optics and Photonic Technology Laboratory, Nanjing University of Information Science and Technology, Nanjing 210044, China$$;Paul Scherrer Institute, WSLA-004, Villigen CH 5232, Switzerland$$

关键词: Surface plasmon polaritons;    waveguide ring resonator;    beam splitter;    finite-difference time-domain method.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

Surface plasmon polaritons (SPPs) beam filter (BF) and beam splitter (BS) constructed using metal heterostructures are proposed and demonstrated numerically. Both structures have a ring metal heterowaveguide, which is constructed by a metal cylinder and a ring dielectric cladding. The two-dimensional finite-difference time-domain (2D-FDTD) method is employed to study the properties of the proposed BF and BS, and the results show that SPPs can effectively propagate on bended plasmonic waveguides with dielectric claddings. By introducing dielectric and plasmonic waveguides on both sides of the resonant ring, SPPs can be efficiently excited at the output of the waveguide ring resonator (WRR) through mode coupling. The planar metal heterostructures provide a way for constructing various nanoscale counterparts of conventional planar integrated devices such as filters, splitters, resonators, sensors, optical switches, and so on.

【 授权许可】

Unknown