Laser-Splashed Three-Dimensional Plasmonic Nanovolcanoes for Steganography in Angular Anisotropy.
Dejiao HuYudong LuYaoyu CaoYinan ZhangYi XuWenxue LiFuhua GaoBoyuan CaiBai-Ou GuanCheng-Wei QiuXiangping LiPublished in: ACS nano (2018)
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 crypto-information 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.
Keyphrases
- high resolution
- physical activity
- optical coherence tomography
- mental health
- single cell
- single molecule
- health information
- high speed
- visible light
- mass spectrometry
- computed tomography
- genome wide
- convolutional neural network
- energy transfer
- circulating tumor cells
- gene expression
- label free
- machine learning
- public health
- social media
- magnetic resonance
- subarachnoid hemorrhage
- dual energy