Color Tunable, Lithography-Free Refractory Metal-Oxide Metacoatings with a Graded Refractive Index Profile.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 36995278.
- Also identified by DOI 10.1021/acs.nanolett.2c04867 and PMC identifier 10103291.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
The refractory metal-oxide semiconductors are an overlooked platform for nanophononics that offer alloys with high melting points and tunable optical constants through stoichiometry changes and ion intercalation. We show that these semiconductors can form metamaterial coatings (metacoatings) made from a set of highly subwavelength, periodic metal-oxide layers (≤20 nm) with a varying and graded refractive index profile that includes a combination of high and low refractive indices and plasmonic layers. These metacoatings exhibit vibrant, structural color arising from the periodic index profile that can be tuned across the visible spectrum, over ultralarge lateral areas through bottom-up thermal annealing techniques.