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Updated: May 28, 2026

Lensless Fluorescent Microscopy on a Chip
Published on: August 17, 2011
Far-field superfocusing with an optical fiber based surface plasmonic lens made of nanoscale concentric annular slits
Yuxiang Liu1, Hua Xu, Felix Stief
1Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA.
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.
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