Standing-wave resonances in plasmonic nanoumbrella cavities for color generation and colorimetric refractive index sensor
Standing-wave resonances in plasmonic nanoumbrella cavities for color generation and colorimetric refractive index sensor
复制标题
用于颜色生成和比色折射率传感器的等离激元纳米伞腔中的驻波共振
DOI：
10.1016/j.apsusc.2016.05.127
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发表时间：
2016-10-30
影响因子：
6.7
通讯作者：
Wu, Wengang
中科院分区：
文献类型：
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作者：
Fan, Jiaorong;Li, Zhongyuan;Wu, Wengang
我们从理论上研究了伞状等离子体纳米结构中元素表面等离子体的杂化，并通过实验证明了等离子体多色超表面的实现及其在比色传感中的应用。三维金属伞阵列由具有金属涂层侧壁的周期性冠层覆盖纳米柱和背板金属膜组成，形成冠层和薄膜的垂直纳米腔。纳米腔中的等离子体耦合和能量限制导致多光谱反射的共振明显变窄。由于多重窄带共振，超表面纳米结构呈现出鲜艳且可调的颜色，具有源自颜色混合机制的宽色域。很容易获得从红色、黄色、绿色、蓝色到紫色的鲜艳颜色。研究还表明，通过测量葡萄糖浓度变化的明显颜色变化，这种等离子体超表面可以作为可行的实时比色折射率传感器。我们的传感器方案显示其在周期性伞形阵列中相对于折射率变化的光谱灵敏度为 242.5 nm/RIU，品质因数为 7.3。此外，比色传感的折射率分辨率已达到0.025 RIU。 (C) 2016 Elsevier B.V. 保留所有权利。
We theoretically investigate the hybridization of the elemental surface plasmons in umbrella-shape plasmonic nanostructures and experimentally demonstrate the implementation of plasmonic multicolor metasurfaces as well as their application in colorimetric sensing. The three-dimension metallic umbrella arrays consist of a periodic canopy-capped-nanopillars with metal-coated sidewall and a backplane metal-film to form vertical nanocavity of canopy and film. Plasmonic coupling and energy confinement in nanocavity induce a noticeably resonance narrowing of multispectral reflection. The metasurfaced nanostructures appeared in vibrant and tunable colors with broad gamut derived from color blending mechanism due to multiple, narrow-band resonances. Vivid colors varied from red, yellow, green, blue to violet are easily achieved. It is also shown that such plasmonic metasurfaces can work as the feasible and real-time colorimetric refractive index sensor by measuring the distinct color variation to glucose concentration changes. Our sensor scheme shows its spectral sensitivity in the periodic umbrella array with respect to the refractive index change to be 242.5 nm/RIU with a figure of merit of 7.3. Furthermore, a refractive index resolution of colorimetric sensing up to 0.025 RIU has been accomplished. (C) 2016 Elsevier B.V. All rights reserved.