@article{fad57913d4a549b6beb1c8607233743a,
title = "Dual-polarity plasmonic metalens for visible light",
abstract = "Surface topography and refractive index profile dictate the deterministic functionality of a lens. The polarity of most lenses reported so far, that is, either positive (convex) or negative (concave), depends on the curvatures of the interfaces. Here we experimentally demonstrate a counter-intuitive dual-polarity flat lens based on helicity-dependent phase discontinuities for circularly polarized light. Specifically, by controlling the helicity of the input light, the positive and negative polarity are interchangeable in one identical flat lens. Helicity-controllable real and virtual focal planes, as well as magnified and demagnified imaging, are observed on the same plasmonic lens at visible and near-infrared wavelengths. The plasmonic metalens with dual polarity may empower advanced research and applications in helicity-dependent focusing and imaging devices, angular-momentum-based quantum information processing and integrated nano-optoelectronics.",
author = "Xianzhong Chen and Lingling Huang and Holger M{\"u}hlenbernd and Guixin Li and Benfeng Bai and Qiaofeng Tan and Guofan Jin and Qiu, \{Cheng Wei\} and Shuang Zhang and Thomas Zentgraf",
note = "Funding Information: This work is partly supported by the Engineering and Physical Sciences Council of the United Kingdom. T.Z. and S.Z. acknowledge the financial support by the European Commission under the Marie Curie Career Integration Programme. B.B. and L.H. acknowledge the support by the National Natural Science Foundation of China (Projects No. 11004119 and No. 61161130005). L.H. acknowledges the Chinese Scholarship Council (CSC, No. 2011621202) for financial support. C.-W.Q. acknowledges the partial support of grant R-263-000-688-112 from the National University of Singapore. We thank Professor R.E. Palmer for use of the Nanoscale Physics Research Laboratory Cleanroom and Dr A.P.G. Robinson for useful conversations. The Oxford Instruments PlasmaPro NGP80 Inductively Coupled Plasma etching system used in this research was obtained through the Birmingham Science City project {\textquoteleft}Creating and Characterising Next Generation Advanced Materials{\textquoteright} supported by Advantage West Midlands (AWM) and partially funded by the European Regional Development Fund (ERDF). X.C. also thanks J.D. Hurman for a critical reading of the initial manuscript.",
year = "2012",
doi = "10.1038/ncomms2207",
language = "English",
volume = "3",
journal = "Nature Communications",
issn = "2041-1723",
publisher = "Nature Research",
}