Scalable ultralight plasmonic paint: A lithography-free approach for sustainable structural coloration (Invited Paper)

Ultralight plasmonic paints offer a groundbreaking, eco-friendly alternative to traditional pigment-based paints, overcoming issues like toxicity, fading, and instability. Unlike conventional structural colors, which are limited by complex nanofabrication methods, this innovation uses a lithography-free, self-assembled plasmonic cavity system. By employing aluminum nanoislands on a thin aluminum oxide layer with a reflective mirror backing, the structure selectively absorbs and reflects light, producing vibrant, angle-independent colors. Remarkably lightweight at only 0.4 g/m², this plasmonic paint is also easily transferable to various substrates. The fabrication process utilizes scalable, cost-efficient techniques, such as electron-beam evaporation, making high-volume production feasible. The flexibility of this design allows for a broad color spectrum, making it suitable for diverse industries. This breakthrough bridges the gap between lab research and industrial production, offering a scalable, low-cost, and sustainable solution for color applications with minimal environmental impact.