期刊
NANO LETTERS
卷 15, 期 5, 页码 3115-3121出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b00181
关键词
nanoantenna; surface plasmon polaritons; directional scattering; mode conversion; single-element
类别
资金
- National Basic Research Program of China [2013CB328704]
- National Natural Science Foundation of China [61475002, 61435001]
Directional light scattering is important in basic research and real applications. This area has been successfully downscaled to wavelength and subwavelength scales With the development of optical antennas, especially single-element nano-antennas. Here, by adding an auxiliary resonant structure to a single-element plasmonic nanoantenna, we show that the highly efficient lowest-order antenna mode can be effectively transferred into inactive higher-order modes. On the basis of this mode conversion, scattered optical fields can be well manipulated by utilizing the interference between different antenna modes. Both broadband directional excitation of surface plasmon polaritons (SPPs) and inversion of SPP launching direction at different wavelengths are experimentally demonstrated as typical examples. The proposed strategy based on mode conversion and mode interference provides new opportunities for the design of nanoscale optical devices, especially directional nanoantennas.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据