Kim Youngji, Hyun Jerome K
Department of Chemistry and Nanoscience, Ewha Womans University, Seoul, 03760, Republic of Korea.
Nanophotonics. 2023 Jun 19;12(16):3341-3349. doi: 10.1515/nanoph-2023-0254. eCollection 2023 Aug.
We present a 1D reflective multi-level structural color design that incorporates Mie, plasmonic, and diffractive mechanisms in the same pixel. Comprised of a metallodielectric grating made of TiO nanowires sandwiched between Ag thin film and Ag substrate, the design can exhibit either a Mie resonance or a localized plasmonic resonance depending on the polarization of incident light, resulting in dramatically different color states. Due to the periodicity, the grating also diffracts light, providing an additional color state. Since diffraction can be turned on or off by the degree of coherence of the incoming light, both Mie and plasmonic colors can be modulated using objective lenses with different numerical apertures. Exploiting the different color generating modes, we encode four layers of information in a pixel array, where each layer is unveiled using a different combination of excitation and imaging settings. These results introduce new possibilities for data encryption, anticounterfeiting, and data storage.
我们提出了一种一维反射式多级结构色设计，该设计在同一像素中结合了米氏散射、等离子体激元和衍射机制。该设计由夹在银薄膜和银衬底之间的TiO纳米线制成的金属介质光栅组成，根据入射光的偏振情况，它可以表现出米氏共振或局域等离子体共振，从而产生截然不同的颜色状态。由于具有周期性，该光栅还会对光进行衍射，提供另一种颜色状态。由于衍射可以通过入射光的相干程度开启或关闭，因此可以使用具有不同数值孔径的物镜来调制米氏色和等离子体色。利用不同的颜色生成模式，我们在像素阵列中编码了四层信息，其中每一层都使用不同的激发和成像设置组合来揭示。这些结果为数据加密、防伪和数据存储带来了新的可能性。
