High-Order Photonic Cavity Modes Enabled 3D Structural Colors

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High-Order Photonic Cavity Modes Enabled 3D Structural Colors
High-Order Photonic Cavity Modes Enabled 3D Structural Colors
Journal Title:
ACS Nano
Publication Date:
09 May 2022
Liu, H., Wang, H., Wang, H., Deng, J., Ruan, Q., Zhang, W., Abdelraouf, O. A. M., Ang, N. S. S., Dong, Z., Yang, J. K. W., & Liu, H. (2022). High-Order Photonic Cavity Modes Enabled 3D Structural Colors. ACS Nano, 16(5), 8244–8252. https://doi.org/10.1021/acsnano.2c01999
It remains a challenge to directly print arbitrary three-dimensional shapes that exhibit structural colors at the micrometer scale. Woodpile photonic crystals (WPCs) fabricated via two-photon lithography (TPL) are elementary building blocks to produce 3D geometries that generate structural colors due to their ability to exhibit either omnidirectional or anisotropic photonic stop bands. However, existing approaches produce structural colors on WPCs when illuminating from the top, requiring print resolutions beyond the limit of commercial TPL, which necessitates postprocessing techniques. Here, we devised a strategy to support high-order photonic cavity modes upon side illumination on WPCs that surprisingly generate prominent reflectance peaks in the visible spectrum. Based on that, we demonstrate one-step printing of 3D photonic structural colors without requiring postprocessing or subwavelength features. Vivid colors with reflectance peaks exhibiting a full width at half-maximum of ∼25 nm, a maximum reflectance of 50%, a gamut of ∼85% of sRGB, and large viewing angles were achieved. In addition, we also demonstrated voxel-level manipulation and control of colors in arbitrary-shaped 3D objects constituted with WPCs as unit cells, which has potential for applications in dynamic color displays, colorimetric sensing, anti-counterfeiting, and light–matter interaction platforms.
License type:
Publisher Copyright
Funding Info:
This research / project is supported by the A*STAR - AME programmatic grant
Grant Reference no. : A18A7b0058
This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Nano, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see doi.org/10.1021/acsnano.2c01999.
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