Ta Van Duong, Chen Rui, Sun Han Dong
Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, Singapore.
Opt Express. 2011 Jul 4;19(14):13598-603. doi: 10.1364/OE.19.013598.
A modified hybrid waveguide with a wide-range coupling and long propagation has been proposed and the coupled mode theory has been applied to study the hybrid waveguide systematically. Two structures are comparatively discussed, namely, a dielectric wire and a circular capillary tube, which are buried in a polymer matrix and separated from the silver substrate by a gap. The simulated results indicate that the circular capillary tube demonstrates a stronger coupling between the surface plasmon polariton and the waveguide mode compared to the solid dielectric wire. Furthermore, the electric field is highly confined in the gap area and can propagate several hundred micrometers.
一种具有宽范围耦合和长传播特性的改进型混合波导已被提出，并应用耦合模理论对该混合波导进行了系统研究。对两种结构进行了比较讨论，即埋入聚合物基体中并与银衬底有一定间隙隔开的介质线和圆形毛细管。模拟结果表明，与实心介质线相比，圆形毛细管在表面等离激元极化激元与波导模式之间表现出更强的耦合。此外，电场高度局限于间隙区域，并且可以传播数百微米。
