Ni et al. present an ultrathin method for designing holograms which can encode information through modulating both the amplitude and phase of the incident light with metamaterial elements. This design utilizes a metasurface to achieve modulation as opposed to many holography techniques which typically adjust the thickness or the index of the material from which the hologram is constructed. The plasmonic metasurface has a thickness of 30 nm, less than 1/23 of the incident wavelength of 676 nm, and successfully generates high-resolution as well as low-noise images, demonstrating the viability of this method for designing planar photonic devices.
Xingjie Ni, Alexander V. Kildishev & Vladimir M. Shalaev
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