School of Physics and Technology, Center for Nanoscience and Nanotechnology, and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Wuhan University, 430072, Wuhan, China.
The Institute for Advanced Studies, Wuhan University, 430072, Wuhan, China.
Nat Commun. 2018 Feb 23;9(1):801. doi: 10.1038/s41467-018-03227-7.
Plasmon rulers can be used for resolving ultrasmall environmental, dimensional, and material changes owing to their high sensitivity associated with a light-scattering spectral shift in response to changes in the separation between plasmonic nanostructures. Here, we show, in several experimental setups, how cavity plasmons in a metal nanowire-on-mirror setup can be used to probe vertical dimensional changes with sub-picometer differential resolutions using two carefully chosen material systems. Specifically, we monitor the dielectric layer thickness changes in response to growth using atomic-layer deposition and to thermal expansion, demonstrating a sensitivity of 14-nm spectral shift per Ångström thickness change and 0.58 pm of vertical differential resolution, respectively. The findings confirm theoretical predictions and highlight the potential use of cavity plasmons in some ultrasensitive sensing applications.
等离子体激元尺可以用于解决超小的环境、尺寸和材料变化，因为它们具有很高的灵敏度，与等离子体纳米结构之间的分离变化引起的光散射光谱位移相关。在这里，我们在几个实验设置中展示了如何使用金属纳米线-镜设置中的腔等离子体来探测垂直尺寸变化，使用两种精心选择的材料系统，具有亚皮米差分分辨率。具体来说，我们监测了原子层沉积过程中对生长的介电层厚度变化和热膨胀的响应，分别证明了每埃厚度变化 14nm 光谱位移和 0.58pm 的垂直差分分辨率的灵敏度。这些发现证实了理论预测，并强调了腔等离子体在一些超灵敏传感应用中的潜在用途。
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