Microchanneled chirped fiber Bragg grating formed by femto-second laser aided chemical etching for refractive index and temperature measurements

Hongyan Fu, Kaiming Zhou, Pouneh Saffari, Chengbo Mou, Lin Zhang, Sailing He, Ian Bennion

Research output: Contribution to journalArticlepeer-review

Abstract

In this work, a microchanneled chirped fiber Bragg grating (MCFBG) is proposed and fabricated through the femtosecond laser-assisted chemical etching. The microchannel (~550 µm) gives access to the external index liquid, thus inducing refractive index (RI) sensitivity to the structure. In the experiment, the transmission bands induced by the reduced effective index in the microchannel region were used to sense the surrounding RI and temperature changes. The experimental results show good agreement with the theoretical analysis. The proposed MCFBG offers enhanced RI sensitivity without degrading the robustness of the device showing good application potential as bio-chemical sensors.

Original languageEnglish
Pages (from-to)1609-1611
Number of pages3
JournalIEEE Photonics Technology Letters
Volume20
Issue number19
DOIs
Publication statusPublished - 1 Oct 2008

Bibliographical note

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Keywords

  • femtosecond laser
  • fiber Bragg gratings
  • refractive index sensor
  • microchannel
  • fiber sensors

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