Plasmonic Color Filters as Dual-State Nanopixels for High-Density Microimage Encoding

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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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Heydari, E., Sperling, J. R., Neale, S. L., & Clark, A. W. (2017). Plasmonic Color Filters as Dual-State Nanopixels for High-Density Microimage Encoding. Advanced Functional Materials, 27(35). https://doi.org/10.1002/adfm.201701866

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