Liu Yuxiang, Xu Hua, Stief Felix, Zhitenev Nikolai, Yu Miao
Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA.
Opt Express. 2011 Oct 10;19(21):20233-43. doi: 10.1364/OE.19.020233.
We present experimental demonstration of light superfocusing by using an optical fiber based surface plasmonic (SP) lens with nanoscale concentric annular slits. A far-field, sub-diffraction-limit sized focus was achieved with an optical fiber based device. The performance of SP lenses with three and four annular slits was experimentally characterized. Guidelines and suggestions on designing the SP lens are provided. As a microscale device with nanoscale features, the fiber-based SP lens can provide a solution to bridging nanophotonics and conventional optics.
我们展示了通过使用具有纳米级同心环形狭缝的基于光纤的表面等离子体（SP）透镜实现光的超聚焦的实验演示。利用基于光纤的器件实现了远场、亚衍射极限尺寸的聚焦。对具有三个和四个环形狭缝的SP透镜的性能进行了实验表征。提供了关于设计SP透镜的指导方针和建议。作为一种具有纳米级特征的微尺度器件，基于光纤的SP透镜可为弥合纳米光子学与传统光学之间的差距提供一种解决方案。
