期刊
ACS NANO
卷 12, 期 9, 页码 9233-9239出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b03964
关键词
laser splashing; structural color; plasmonic nanostructures; angular anisotropy; steganography
类别
资金
- National Key R&D Program of China [YS2018YFB110012]
- National Natural Science Foundation of China (NSFC) [21317137, 61522504, 91750110]
- Guangdong Provincial Innovation and Entrepreneurship Project [2016ZT06D081]
- National Research Foundation, Prime Minister's Office, Singapore under its Competitive Research Program (CRP award) [NRF-CRP15-2015-03]
Planar optics constructed from subwavelength artificial atoms have been suggested as a route to the physical realization of steganography with controlled intrinsic redundancy at single-pixel levels. Unfortunately, two-dimensional geometries with uniform flat profiles offer limited structural redundancy and make it difficult to create advanced cryptoinformation in multiplexed physical divisions. Here, we reveal that splashing three-dimensional (3D) plasmonic nanovolcanoes could allow for a steganographic strategy in angular anisotropy, with high resolution, full coloration, and transient control of structural profiles. Highly reproducible 3D morphologies of volcanic nanosplashes are demonstrated by creating a standardized recipe of laser parameters. Such single nanovolcanoes can be well controlled individually at different splashing stages and thus provide a lithography-free fashion to access various spectral responses of angularly coordinated transverse and vertical modes, leading to the full-range coloration. This chip-scale demonstration of steganographic color images in angular anisotropy unfolds a long-ignored scheme for structured metasurfaces and thereby provides a paradigm for information security and anticounterfeiting.
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