Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 18, Pages 11690-11697Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b01585
Keywords
metamaterial; plasmonic absorber; high resolution printing; electrohydrodynamic NanoDrip printing; gold nanoparticle dispersion
Funding
- Swiss National Science Foundation [146180]
- European Research Council under the European Union's Seventh Framework Programme (FP)/ERC [339905]
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The fabrication of functional metamaterials with extreme feature resolution finds a host of applications such as the broad area of surface/light interaction. Nonplanar features of such structures can significantly enhance their performance and tunability, but their facile generation remains a challenge. Here, we show that carefully designed out-of-plane nanopillars made of metal-dielectric composites integrated in a metaldielectric-nanocomposite configuration can absorb broadband light very effectively. We further demonstrate that electro-hydrodynamic printing in a rapid nanodripping mode is able to generate precise out-of-plane forests of such composite nanopillars with deposition resolutions at the diffraction limit on flat and nonflat substrates. The nanocomposite nature of the printed material allows the fine-tuning of the overall visible light absorption from complete absorption to complete reflection by simply tuning the pillar height. Almost perfect absorption (similar to 95%) over the entire visible spectrum is achieved by a nanopillar forest covering only 6% of the printed area. Adjusting the height of individual pillar groups by design, we demonstrate on-demand control of the gray scale of a micrograph with a spatial resolution of 400 nm. These results constitute a significant step forward in ultrahigh resolution facile fabrication of out-of-plane nanostructures, important to a broad palette of light design applications.
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