Expanding the plasmonic painter’s palette

By blending paints in their palette, artists can create a broad spectrum of colors with subtly different hues. However, scientists who wish to create a similar range of structural colors, like those found on butterfly wings, are much more limited. Now, researchers reporting in ACS Nano have developed a new method for mixing plasmonic red, blue and green to yield a virtually unlimited number of colors that could be used for new types of displays. Unlike pigments, structural colors get their hues by reflecting light from microscopic textures. Scientists can create some of these colors by putting metal nanoparticles onto surfaces in various patterns. These “plasmonically induced” colors are less susceptible to fading than pigments, and they might be useful for new types of paint, electronic displays and anti-counterfeiting measures. But producing a gamut of structural colors with smooth transitions between hues and tones has been challenging. Therefore, Dimos Poulikakos, Hadi Eghlidi and colleagues wanted to develop a new plasmonic color-mixing approach that would allow countless color variations.

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