A plasmonic slot rectangular nano-resonator embedded in a metal-coated optical microfiber tip is theoretically and experimentally demonstrated. In this device, light is transversely coupled from the optical microfiber tip into the plasmonic slot nano-resonator, showing strong localization in three dimensions and strong enhancement factor (7.24x10^3). This device can find wide range of applications such as surface enhanced Raman scattering, optical filtering, spectroscopy, and bio-sensing.
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