Current surface-enhanced Raman scattering (SERS)-based anticounterfeiting strategies primarily encode molecular information in single two-dimensional (2D) planes and under-utilize the three-dimensionality (3D) of plasmonic hot spots. Here, we demonstrate a 3D SERS anticounterfeiting platform, extending “layered security” capabilities from 2D to 3D. We achieve this capability by combining 3D candlestick microstructures with 3D hyperspectral SERS imaging to fully resolve at least three layers of encoded information within the same 2D area along the z-axis, notably using only a single probe molecule. Specific predesigned covert images can only be fully recovered via SERS imaging at predetermined z values. Furthermore, our 3D SERS anticounterfeiting security labels can be fabricated on both rigid and flexible substrates, widening their potential usages to curved product surfaces and banknotes.

中文翻译：

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灵活的三维防伪等离子体安全标签：利用依赖于Z轴的SERS读数对多层分子信息进行编码

当前基于表面增强拉曼散射（SERS）的防伪策略主要在单个二维（2D）平面中编码分子信息，而未充分利用等离子体热点的三维（3D）。在这里，我们演示了一个3D SERS防伪平台，它将“分层安全性”功能从2D扩展到了3D。我们通过将3D烛台微结构与3D高光谱SERS成像相结合，以完全分辨沿着z轴在同一2D区域内的至少三层编码信息，特别是仅使用单个探针分子，来实现此功能。特定的预先设计的秘密图像只能通过以预定z轴进行SERS成像才能完全恢复价值观。此外，我们的3D SERS防伪安全标签可以在刚性和柔性基材上制造，从而将其潜在用途扩展到弯曲的产品表面和钞票上。