Tapered ultra-high numerical aperture optical fiber tip for nitrogen vacancy ensembles based endoscope in a fluidic environment

@article{Duan2019TaperedUN,
  title={Tapered ultra-high numerical aperture optical fiber tip for nitrogen vacancy ensembles based endoscope in a fluidic environment},
  author={De-Wen Duan and Vinaya Kumar Kavatamane and Sri Ranjini Arumugam and Yan-Kai Tzeng and Huan‐Cheng Chang and Gopalakrishnan Balasubramanian},
  journal={Applied Physics Letters},
  year={2019}
}
Fixing a diamond containing a high density of Nitrogen-Vacancy (NV) center ensembles on the apex of a multimode optical fiber (MMF) extends the applications of NV-based endoscope sensors. Replacing the normal MMF with a tapered MMF (MMF-taper) has enhanced the fluorescence (FL) collection efficiency from the diamond and achieved a high spatial resolution NV-based endoscope. The MMF-taper's high FL collection efficiency is the direct result of multiple internal reflections in the tapered region… 

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