Photofield electron emission from an optical fiber nanotip

  title={Photofield electron emission from an optical fiber nanotip},
  author={Sam Keramati and Ali Passian and Vineet Khullar and Herman Batelaan},
  journal={arXiv: Applied Physics},
We demonstrate a nanotip electron source based on a graded index multimode silica optical fiber, tapered at one end to a radius of curvature r ~ 50 nm and coated with a thin film of gold. We report observation of laser-induced electron photoemission at tip bias potentials below the onset of dark field emission (FE). Single-photon photofield emission (PFE) is identified as the emission mechanism, which exhibits fast switching times with an upper limit on the order of 1 {\mu}s. The explored fiber… 

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