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Printable Nanoscopic Metamaterial Absorbers and Images with Diffraction-Limited Resolution
Abstract
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 metal-dielectric-nanocomposite configuration can absorb broadband light very effectively. We further demonstrate that electrohydrodynamic 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 (∼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- Text
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- pillar groups
- nonflat substrates
- light absorption
- diffraction limit
- nanopillar forest
- feature resolution
- Printable Nanoscopic Metamaterial Absorbers
- pillar height
- nanodripping mode
- deposition resolutions
- ultrahigh resolution
- broadband light
- nanocomposite nature
- electrohydrodynamic printing
- Nonplanar features
- fabrication
- 400 nm
- light design applications