Evaluation of slot-to-slot coupling between dielectric slot waveguides and metal-insulator-metal slot waveguides

作     者：Kong, Deqing Tsubokawa, Makoto 

作者机构：Waseda Univ Aizu Wakamatsu Kitakyusu 8080135 Japan 

出 版 物：《OPTICS EXPRESS》 (Opt. Express)

年 卷 期：2015年第23卷第15期

页      面：19082-19091页

核心收录：

学科分类：070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：Grants-in-Aid for Scientific Research Funding Source: KAKEN 

主　　题：Bend loss Dielectric waveguides Plasmon waveguides Slot waveguides Waveguide modes Waveguides 

摘      要：We numerically analyzed the power-coupling characteristics between a high-index-contrast dielectric slot waveguide and a metal-insulator-metal (MIM) plasmonic slot waveguide as functions of structural parameters. Couplings due mainly to the transfer of evanescent components in two waveguides generated high transmission efficiencies of 62% when the slot widths of the two waveguides were the same and 73% when the waveguides were optimized by slightly different widths. The maximum transmission efficiency in the slot-to-slot coupling was about 10% higher than that in the coupling between a normal slab waveguide and an MIM waveguide. Large alignment tolerance of the slot-to-slot coupling was also proved. Moreover, a small gap inserted into the interface between two waveguides effectively enhances the transmission efficiency, as in the case of couplings between a normal slab waveguide and an MIM waveguide. In addition, couplings with very wideband transmissions over a wavelength region of a few hundred nanometers were validated. (C) 2015 Optical Society of America