Journal
NANO LETTERS
Volume 16, Issue 8, Pages 5235-5240Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b02326
Keywords
Dielectric metasurface; color hologram; visible; multiwavelength; achromatic hologram; highly dispersive hologram
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Funding
- National Basic Research Program of China [2013CB921904]
- National Natural Science Foundation of China [11474010, 61590933]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry [Y5691I11GJ]
- Youth Innovation Promotion Association CAS [Y5442912ZX]
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Dielectric metasurfaces built up with nanostructures of high refractive index represent a powerful platform for highly efficient flat optical devices due to their easy-tuning electromagnetic scattering properties and relatively high transmission efficiencies. Here we show visible-frequency silicon metasurfaces formed by three kinds of nanoblocks multiplexed in a subwavelength unit to constitute a metamolecule, which are capable of wavefront manipulation for red, green, and blue light simultaneously. Full phase control is achieved for each wavelength by independently changing the in-plane orientations of the corresponding nanoblocks to induce the required geometric phases. Achromatic and highly dispersive meta-holograms are fabricated to demonstrate the wavefront manipulation with high resolution. This technique could be viable for various practical holographic applications and flat achromatic devices.
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