Leaky Modes in Ag Nanowire over Substrate Configuration

作     者：Yin-Xing Ding Lu-Lu Wang Li Yu 丁银兴;王鲁櫓;于丽

作者机构：State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Belting 100876 School of Science Beijing University of Posts and Telecommunications Beijing 100876 

出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)

年 卷 期：2017年第34卷第9期

页      面：58-61页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：Supported by the Ministry of Science and Technology of China under Grant No 2016YFA0301300 the National Natural Science Foundation of China under Grant Nos 11374041,11574035 and 11404030 the State Key Laboratory of Information Photonics and Optical Communications 

主　　题：SILVER nanoparticles NANOWIRES SURFACE plasmons REFRACTIVE index IMAGING systems ELECTRIC fields 

摘      要：By launching surface plasmons propagating along the Ag nanowire deposited on a substrate, we clearly observe three leaky modes using the Fourier imaging method. The effective refractive indexes, propagation lengths and electric field distributions of the modes are investigated, which indicate that the energy of the mode with a lowest effective refractive index is mainly distributed in the air, while for the other two modes, it is mainly distributed in the substrate and in the gap between the Ag nanowire and the substrate. These modes enable such a configuration to be used as a multichannel waveguide or highly directional optical antenna, which is of fundamental importance for optical device miniaturizations and photonic circuit integrations.