ArticleACS applied optical materials2025
Semimetal/Substrate Cavities Enabling Industrial Materials for Structural Coloring.
Article in ACS applied optical materials, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Color coatings are essential for the identification and safety of everyday objects as well as for the protection of surfaces from deterioration, in addition to their well-known use for enhancing their aesthetic appeal. However, conventional dyes and pigments are a major source of contamination and degrade easily over time. Structural coloring is a sustainable alternative capable of producing high-quality colors with nanometric structures. Nonetheless, many approaches to structural coloring rely on lithography or expensive back-reflectors made from noble metals. In this study, we approach surface coloring using lightweight, sustainable, and scalable optical coatings with subwavelength thickness. This method allows industrial surfaces to function as active elements in the color-generating structure, eliminating the need for metallic mirrors. The design is based on a semimetal/substrate cavity (SSC), directly deposited onto the surface to be colored. As a proof of concept, we designed and fabricated SSCs on silicon and stainless steel substrates, using ultrathin films of bismuth (Bi) and aluminum oxide (Al
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