Ultrabroadband superoscillatory lens composed by plasmonic metasurfaces for subdiffraction light focusing
Dongliang Tang, Changtao Wang, Zeyu Zhao, Yanqin Wang, Mingbo Pu, Xiong Li, Ping Gao and Xiangang Luo
Article first published online: 24 SEP 2015 | DOI: 10.1002/lpor.201500182
Ultrabroadband optical superoscillatory lens and subdiffraction focusing in the far field are proposed and demonstrated with a plasmonic metasurface. The ultrabroadband feature mainly arises from the dispersionless phase profile across visible and near-infrared light wavelengths. This method is believed to provide a promising access to broadband far-field optics beyond the Abbe diffraction limit, such as microscope and telescope systems.