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Reconstructing a plasmonic metasurface for a broadband high-efficiency optical vortex in the visible frequency

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Abstract

Metasurfaces consisting of a two-dimensional metallic nano-antenna array are capable of transferring a Gaussian beam into an optical vortex with a helical phase front and a phase singularity by manipulating the polarization/phase status of light. This miniaturizes a laboratory scaled optical system into a wafer scale component, opening up a new area for broad applications in optics. However, the low conversion efficiency to generate a vortex beam from circularly polarized light hinders further development. This paper reports our recent success in improving the efficiency over a broad waveband at the visible frequency compared with the existing work. The choice of material, the geometry and the spatial organization of meta-atoms, and the fabrication fidelity are theoretically investigated by the Jones matrix method. The theoretical conversion efficiency over 40% in the visible wavelength range is worked out by systematic calculation using the finite difference time domain (FDTD) method. The fabricated metasurface based on the parameters by theoretical optimization demonstrates a high quality vortex in optical frequencies with a significantly enhanced efficiency of over 20% in a broad waveband.

Graphical abstract: Reconstructing a plasmonic metasurface for a broadband high-efficiency optical vortex in the visible frequency

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Publication details

The article was received on 13 Mar 2018, accepted on 16 May 2018 and first published on 24 May 2018


Article type: Paper
DOI: 10.1039/C8NR02088D
Citation: Nanoscale, 2018, Advance Article
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    Reconstructing a plasmonic metasurface for a broadband high-efficiency optical vortex in the visible frequency

    B. Lu, J. Deng, Q. Li, S. Zhang, J. Zhou, L. Zhou and Y. Chen, Nanoscale, 2018, Advance Article , DOI: 10.1039/C8NR02088D

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