Open AccessHighly efficient nanofocusing based on a T-shape micro-slit surrounded with multi-slits
Author(s) -
Jianjun Chen,
Chen Wang,
Guowei Lü,
Wenqiang Li,
Jinghua Xiao,
Qihuang Gong
Publication year - 2012
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.017734
Subject(s) - slit , optics , interference (communication) , materials science , aperture (computer memory) , numerical aperture , fabrication , near field scanning optical microscope , multi mode optical fiber , optical microscope , physics , optical fiber , scanning electron microscope , computer science , wavelength , computer network , channel (broadcasting) , acoustics , medicine , alternative medicine , pathology
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.