Chemical sensing with microbent optical fiber.

  title={Chemical sensing with microbent optical fiber.},
  author={S TAC and Nibu A George and Palanivelu Sureshkumar and Padmanabhan Radhakrishnan and Chakkalakkal P G Vallabhan and Vadakkedathu Parameswaran Narayana Nampoori},
  journal={Optics letters},
  volume={26 20},
We propose and demonstrate the possibility of using a permanently microbent bare optical fiber for detecting chemical species. Two detection schemes, viz., a bright-field detection scheme (for the core modes), and a dark-field detection scheme (for the cladding modes) have been employed to produce a fiber-optic sensor. The sensor described here is sensitive enough to detect concentrations as low as nanomoles per liter of a chemical species, with a dynamic range of more than 6 orders of… CONTINUE READING