title: Far-field superfocusing with an optical fiber based surface plasmonic lens made of nanoscale concentric annular slits.
abstract: 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.
authors: Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA.
authors: Yuxiang
authors: Y
authors: Liu
authors: Hua
authors: H
authors: Xu
authors: Felix
authors: F
authors: Stief
authors: Nikolai
authors: N
authors: Zhitenev
authors: Miao
authors: M
authors: Yu
mesh_terms: D015374:Biosensing Techniques; D004867:Equipment Design; D005336:Fiber Optic Technology; D007368:Interferometry / Q000379:methods; D007834:Lasers; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning / Q000379:methods; D015233:Models, Statistical; D049329:Nanostructures; D036103:Nanotechnology / Q000379:methods*; D055100:Optical Fibers; D020349:Surface Plasmon Resonance