期刊
NANO LETTERS
卷 21, 期 11, 页码 4721-4729出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c00979
关键词
structural color; 3D printing; two-photon polymerization lithography; grayscale painting; optical steganography; nanopillar
类别
资金
- National Research Foundation (NRF) Singapore [NRF-CRP001-021, CRP20-2017-0004, NRF-NRFI06-2020-0005]
- Singapore University of Technology and Design (SUTD) Digital Manufacturing and Design (DManD) Center [RGDM 1830303]
- THALES-SUTD projects [RGTHALES1801, RGTHALES1901]
The study reports a method for color and grayscale generation based on tuning a single nanostructure geometry, systematically investigated color generation from basic single nanopillar geometry in low-refractive-index material through two-photon polymerization lithography.
Sculpting nanostructures into different geometries in either one or two dimensions produces a wide range of colorful elements in microscopic prints. However, achieving different shades of gray and control of color saturation remain challenging. Here, we report a complete approach to color and grayscale generation based on the tuning of a single nanostructure geometry. Through two-photon polymerization lithography, we systematically investigated color generation from the basic single nanopillar geometry in low-refractive-index (n < 1.6) material. Grayscale and full color palettes were achieved that allow decomposition onto hue, saturation, and brightness values. This approach enabled the painting of arbitrary colorful and grayscale images by mapping desired prints to precisely controllable parameters during 3D printing. We further extend our understanding of the scattering properties of the low-refractive-index nanopillar to demonstrate grayscale inversion and color desaturation and steganography at the level of single nanopillars.
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