title: Highly efficient nanofocusing based on a T-shape micro-slit surrounded with multi-slits.
abstract: Highly efficient plasmonic nanofocusing is proposed and demonstrated in a T-shape micro-slit surrounded by multi-slits. The nanofocusing phenomenon is achieved based on the multimode interference in the micro-slit, the constructive interference in the T-shape slit, and also the multiple-beam interference of the light radiated from the multi-slits and the transmitted light from the T-shape micro-slit. Because of the large illumination areas of the incident light on the wide slit aperture in the proposed structure, a large amount of light can pass through the wide slit. This leads to a highly efficient nanofocusing. Meanwhile, the wide slit means easy fabrication. In the experiment, the focusing phenomenon in the proposed structure was successfully demonstrated with a scanning near-field optical microscopy (SNOM) technology.
authors.affiliation: State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China. chernmore@pku.edu.cn
authors.forename: Jianjun
authors.initials: J
authors.lastname: Chen
authors.forename: Chen
authors.initials: C
authors.lastname: Wang
authors.forename: Guowei
authors.initials: G
authors.lastname: Lu
authors.forename: Wenqiang
authors.initials: W
authors.lastname: Li
authors.forename: Jinghua
authors.initials: J
authors.lastname: Xiao
authors.forename: Qihuang
authors.initials: Q
authors.lastname: Gong