Dual-polarity plasmonic metalens for visible light

Xianzhong Chen, Lingling Huang, Holger Mühlenbernd, Guixin Li, Benfeng Bai, Qiaofeng Tan, Guofan Jin, Cheng-Wei Qiu, Shuang Zhang () and Thomas Zentgraf ()
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Xianzhong Chen: School of Physics and Astronomy, University of Birmingham
Lingling Huang: School of Physics and Astronomy, University of Birmingham
Holger Mühlenbernd: University of Paderborn
Guixin Li: Hong Kong Baptist University
Benfeng Bai: State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University
Qiaofeng Tan: State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University
Guofan Jin: State Key Laboratory of Precision Measurement Technology and Instruments, Tsinghua University
Cheng-Wei Qiu: National University of Singapore
Shuang Zhang: School of Physics and Astronomy, University of Birmingham
Thomas Zentgraf: University of Paderborn

Nature Communications, 2012, vol. 3, issue 1, 1-6

Abstract: 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.

Date: 2012
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DOI: 10.1038/ncomms2207

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