What is it about?
Copper is a noble metal that due to its optical properties reflects a reddish color. However, if copper is split in very thin films separated by layers of lossless dielectric materials, such as silicon dioxide, many colors can be created, including blue.
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Why is it important?
Color filters based on metallic nanostructures introduce an alternative to obtain colors with improved saturation and brightness.
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This page is a summary of: Reflective color filters based on SiO2/Cu multilayer stacks, Journal of Applied Physics, August 2023, American Institute of Physics, DOI: 10.1063/5.0162650.
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