Structural colors have drawn wide attention for their potential as a future printing technology for various applications
ranging from biomimetic tissues to adaptive camouflage materials. However
an efficient approach to realize robust colors with a scalable fabrication technique is still lacking
hampering the realization of practical applications with this platform. Here
we develop a new approach based on large-scale network metamaterials that combine dealloyed subwavelength structures at the nanoscale with lossless
ultra-thin dielectric coatings. By using theory and experiments
we show how subwavelength dielectric coatings control a mechanism of resonant light coupling with epsilon-near-zero regions generated in the metallic network
generating the formation of saturated structural colors that cover a wide portion of the spectrum. Ellipsometry measurements support the efficient observation of these colors
even at angles of 70°. The network-like architecture of these nanomaterials allows for high mechanical resistance
which is quantified in a series of nano-scratch tests. With such remarkable properties
these metastructures represent a robust design technology for real-world
large-scale commercial applications.
关键词
Keywords
nanophotonicsplasmonicsstructural colors
references
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