Journal
LIGHT-SCIENCE & APPLICATIONS
Volume 6, Issue -, Pages -Publisher
CHINESE ACAD SCIENCES, CHANGCHUN INST OPTICS FINE MECHANICS AND PHYSICS
DOI: 10.1038/lsa.2016.233
Keywords
nanophotonics; plasmonics; structural colors
Categories
Funding
- Air Force Office of Scientific Research [MURI: FA9550-14-1-0389]
- National Science Foundation under NSF [1541959]
- KAUST [CRG-1-2012-FRA-005]
- 'Size matters' project (TDA Capital Ltd, London, UK)
- Master Thesis Grant of the Zeno Karl Schindler Foundation (Switzerland)
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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 degrees. 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.
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