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Issue 3, 2016
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A facile grating approach towards broadband, wide-angle and high-efficiency holographic metasurfaces

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Abstract

We analytically show that an incident light can be almost completely diffracted into the −1st order in wide-angle and broadband by suitably designed thin metallic nano-gratings with simple rectangular cross sections. Such extraordinary optical diffraction results from the excitation of localized cavity modes and exists even when the grating period is modulated in a broad range. By modulating the period with binary holography techniques, we can shape an incident wave into arbitrary wavefronts with near-unity conversion efficiencies. To show the efficacy of this approach, we demonstrate three reflection-type metasurfaces for achieving near-complete conversions from a Gaussian beam into a focused beam, Bessel beam, and vortex beam, respectively, with the complete suppression of the undesired specular reflection. Our findings provide a facile approach to build arbitrary wavefront-shaping metasurfaces with wide-angle, broadband, and high efficiency performance.

Graphical abstract: A facile grating approach towards broadband, wide-angle and high-efficiency holographic metasurfaces

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Publication details

The article was received on 16 Oct 2015, accepted on 08 Dec 2015 and first published on 09 Dec 2015


Article type: Paper
DOI: 10.1039/C5NR07181J
Citation: Nanoscale, 2016,8, 1588-1594
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    A facile grating approach towards broadband, wide-angle and high-efficiency holographic metasurfaces

    Z. Deng, S. Zhang and G. P. Wang, Nanoscale, 2016, 8, 1588
    DOI: 10.1039/C5NR07181J

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