Journal
NANOSCALE
Volume 8, Issue 3, Pages 1588-1594Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5nr07181j
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Funding
- National Natural Science Foundation of China (NSFC) [11274247, 11574218, 11504243]
- Natural Science Foundation of Guangdong Province, China [2015A030310400]
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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.
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