期刊
ACS NANO
卷 10, 期 4, 页码 4609-4617出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b00816
关键词
nanofabrication; near-field phase shift lithography; conformal phase masks; hierarchical structures; antireflective diffusers; biomimetics
类别
资金
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning (MSIP) [2014M3A6B3063708]
- National Research Foundation of Korea (NRF) - Korean Government (MSIP) [2015R1A5A7036513]
- National Research Foundation of Korea [2015R1A5A7036513] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Multilevel hierarchical platforms that combine nano- and microstructures have been intensively explored to mimic superior properties found in nature. However, unless directly replicated from biological samples, desirable multiscale structures have been challenging to efficiently produce to date. Departing from conventional wafer-based technology, new and efficient techniques suitable for fabricating bioinspired structures are highly desired to produce three-dimensional architectures even on nonplanar substrates. Here, we report a facile approach to realize functional nanostructures on uneven microstructured platforms via scalable optical fabrication techniques. The ultrathin form (similar to 3 mu m) of a phase grating composed of poly(vinyl alcohol) makes the material physically flexible and enables full-conformal contact with rough surfaces. The near-field optical effect can be identically generated on highly curved surfaces as a result of superior conformality. Densely packed nanodots with submicron periodicity are uniformly formed on microlens arrays with a radius of curvature that is as low as similar to 28 mu m. Increasing the size of the gratings causes the production area to be successfully expanded by up to 16 in(2). The nano-on-micro structures mimicking real compound eyes are transferred to flexible and stretchable substrates by sequential imprinting, facilitating multifunctional optical films applicable to antireflective diffusers for large-area sheet-illumination displays.
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