Microstructures made in optical fiber with femtosecond laser

Kaiming Zhou, Lin Zhang, Xianfeng F. Chen, Vladimir Mezentsev, Ian Bennion

Research output: Contribution to journalArticlepeer-review


Different types of microstructures including microchannels and microslots were made in optical fibers using femtosecond laser inscription and chemical etching. Integrated with UV-inscribed fiber Bragg gratings, these microstructures have miniature, robustness and high sensitivity features and have been used to implement novel devices for various sensing applications. The fiber microchannels were used to detect the refractive index change of liquid presenting sensitivities up to 7.4 nm/refractive index unit (RIU) and 166.7 dB/RIU based on wavelength and power detection, respectively. A microslot-in-fiber based liquid core waveguide as a refractometer has been proposed and the device was used to measure refractive index, and a sensitivity up to 945 nm/RIU (10-6/pm) was obtained. By filling epoxy in the microslot and subsequent UV light curing, a hybrid waveguide grating structure with polymer core and glass cladding was fabricated. The obtained device was highly thermal responsive, demonstrating a linear coefficient of 211 pm/°C.
Original languageEnglish
Pages (from-to)237-248
Number of pages12
JournalInternational Journal of Smart and Nano Materials
Issue number4
Publication statusPublished - Feb 2010


  • ultrafast laser
  • optical fiber
  • fiber Bragg grating


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