Journal
NANOSCALE
Volume 11, Issue 44, Pages 21266-21274Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nr07408b
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Funding
- Office of Naval Research (ONR) [N00014-18-1-2055]
- National Science Foundation [ECCS-1542174]
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In contrast to lossy plasmonic metasurfaces (MSs), wideband dielectric MSs comprising subwavelength nanostructures supporting Mie resonances are of great interest in the visible wavelength range. Here, for the first time to our knowledge, we experimentally demonstrate a reflective MS consisting of a square-lattice array of hafnia (HfO2) nanopillars to generate a wide color gamut. To design and optimize these MSs, we use a deep-learning algorithm based on a dimensionality reduction technique. Good agreement is observed between simulation and experimental results in yielding vivid and high-quality colors. We envision that these structures not only empower the high-resolution digital displays and sensitive colorimetric biosensors but also can be applied to on-demand applications of beaming in a wide wavelength range down to deep ultraviolet.
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