14 March 2016 Broadband meta-hologram composed of Z-shaped nano-antennas
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Metasurfaces refer to periodic arrays of thin nano-antennas which are separated by subwavelength length. Due to the strong capability of nano-antenna distributions in phase profile generation, hologram generation using metasurfaces has attracted attention of many researchers. We propose a reflective type hologram by a metasurface composed of Z-shaped nano-antennas. The proposed metasurface renders precise phase modulation with spatially varying orientation, which attributes to the increase of the level of phase distribution. It has different plasmonic resonance mode for the orthogonal linear polarized incidence that makes different phase delay effect for orthogonal input. The metasurface we propose shows phase modulation characteristics over a wide wavelength range between 800 nm and 1,500 nm. Also it achieves high polarization conversion efficiency above 80% in a broad bandwidth. Meta-hologram using the metasurface has opened the possibility of variety of structures and expanded to near-infrared region. We expect our proposal could be applied to the more complicated meta-holograms.
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Sang-Eun Mun, Sang-Eun Mun, Yohan Lee, Yohan Lee, Joonsoo Kim, Joonsoo Kim, Byoungho Lee, Byoungho Lee, } "Broadband meta-hologram composed of Z-shaped nano-antennas", Proc. SPIE 9756, Photonic and Phononic Properties of Engineered Nanostructures VI, 97561Y (14 March 2016); doi: 10.1117/12.2211950; https://doi.org/10.1117/12.2211950

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