Plasmonic Color Filters as Dual‐State Nanopixels for High‐Density Microimage Encoding |
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| Authors: | Esmaeil Heydari Justin R. Sperling Steven L. Neale Alasdair W. Clark |
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| Affiliation: | Biomedical Engineering Research Division, School of Engineering, University of Glasgow, Glasgow, UK |
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| Abstract: | Plasmonic color filtering has provided a range of new techniques for “printing” images at resolutions beyond the diffraction‐limit, significantly improving upon what can be achieved using traditional, dye‐based filtering methods. Here, a new approach to high‐density data encoding is demonstrated using full color, dual‐state plasmonic nanopixels, doubling the amount of information that can be stored in a unit‐area. This technique is used to encode two data sets into a single set of pixels for the first time, generating vivid, near‐full sRGB (standard Red Green Blue color space)color images and codes with polarization‐switchable information states. Using a standard optical microscope, the smallest “unit” that can be read relates to 2 × 2 nanopixels (370 nm × 370 nm). As a result, dual‐state nanopixels may prove significant for long‐term, high‐resolution optical image encoding, and counterfeit‐prevention measures. |
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| Keywords: | color printing image encoding metasurfaces nanopixels plasmonic color filters |
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