Xiang Yifeng, Chen Junxue, Tang Xi, Wang Ruxue, Zhan Qiwen, Lakowicz Joseph R, Zhang Douguo
Key Laboratory of OptoElectronic Science and Technology for Medicine of Ministry of Education, Fujian Provincial Key Laboratory of Photonics Technology, College of Photonic and Electronic Engineering, Fujian Normal University, Fuzhou 350117, China.
College of Science, Guilin University of Technology, Guilin, 541004, China.
Nanophotonics. 2021 Feb;10(3):1099-1106. doi: 10.1515/nanoph-2020-0500. Epub 2020 Dec 18.
When an ultrathin silver nanowire with a diameter less than 100 nm is placed on a photonic band gap structure, surface plasmons can be excited and propagate along two side-walls of the silver nanowire. Although the diameter of the silver nanowire is far below the diffraction limit, two bright lines can be clearly observed at the image plane by a standard wide-field optical microscope. Simulations suggest that the two bright lines in the far-field are caused by the unique phase distribution of plasmons on the two side-walls of the silver nanowire. Combining with the sensing ability of surface plasmons to its environment, the configuration reported in this work is capable of functioning as a sensing platform to monitor environmental changes in the near-field region of this ultrathin nanowire.
当一根直径小于100纳米的超薄银纳米线放置在光子带隙结构上时，表面等离子体激元能够被激发并沿着银纳米线的两个侧壁传播。尽管银纳米线的直径远低于衍射极限，但通过标准的宽场光学显微镜在像平面上可以清晰地观察到两条亮线。模拟结果表明，远场中的这两条亮线是由银纳米线两个侧壁上等离子体激元独特的相位分布引起的。结合表面等离子体激元对其环境的传感能力，这项工作中报道的结构能够作为一个传感平台，用于监测该超薄纳米线近场区域的环境变化。
