Photoluminescence via gap plasmons between single silver nanowires and a thin gold film.
Photoluminescence via gap plasmons between single silver nanowires and a thin gold film.
复制标题
DOI：
10.1039/c3nr03624c
复制
发表时间：
2013-11
期刊：
影响因子：
6.7
通讯作者：
Hailong Hu;Y. Akimov;H. Duan;Xianglin Li;Mingyi Liao;Rachel Lee Siew Tan;Lin Wu;Hongyu Chen;Hongjin Fan;P. Bai;Pooi See Lee;Joel K. W. Yang;Z. Shen
中科院分区：
文献类型：
--
作者：
Hailong Hu;Y. Akimov;H. Duan;Xianglin Li;Mingyi Liao;Rachel Lee Siew Tan;Lin Wu;Hongyu Chen;Hongjin Fan;P. Bai;Pooi See Lee;Joel K. W. Yang;Z. Shen
在这项工作中，我们调查的单光子光致发光系统组成的银纳米线的Au膜与~6 nm的介电间隔，支持本地化的共振称为差距等离子体模式。虽然Ag纳米线和Au膜本身表现出弱的光致发光，但组合系统产生增强的PL发射。我们的分析表明，在这个系统中的强大的PL发射是由于增强的激光吸收，PL发射的Au，与银纳米线作为一个有效的天线。由于差距模式的PL是敏感的激光激发相对于纳米线取向的偏振，并显示出清晰的偶极发射轮廓。发现PL发射波长仅取决于纳米线的宽度，而与其长度无关。模拟结果表明，间隙等离子体激元的激发光偏振的纳米线长度的横向支持这些意见。
In this work, we investigate the one-photon photoluminescence from a system consisting of an Ag nanowire on an Au film with a ~6 nm dielectric spacer that supports a localized resonance known as the gap plasmon mode. Although the Ag nanowire and Au film exhibit weak photoluminescence on their own, the combined system produces an enhanced PL emission. Our analysis reveals that the strong PL emission in this system was due to the enhanced laser absorption in, and PL emission from Au, with the Ag nanowire acting as an efficient antenna. The PL due to the gap mode is sensitive to the polarization of the laser excitation with respect to the nanowire orientation, and shows a clear dipolar emission profile. PL emission wavelengths were found to depend only on the nanowire width, and independent of its length. These observations were supported by simulation results indicating that gap plasmons are excited by light polarized transverse to the nanowire length.