Trench-embedding fiber taper sensor fabricated by a femtosecond laser for gas refractive index sensing

Zhitao Cao, Lan Jiang, Sumei Wang, Peng Wang, Fei Zhang, Yongfeng Lu

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

A fiber in-line, multimode coupling interferometer with a trench-embedding, fiber taper probe is proposed and fabricated by femtosecond-laser-induced water breakdown. The reflection-type taper probe is used for gas refractive index (RI) detection from 1.0001143 to 1.0002187 and temperature sensing from 50°C to 500°C. The largest RI sensitivity of the taper probe embedded with a trench at a width of 18.4 μm is 669.502 nm/RIU for hybrid nitrogen and helium. Temperature sensitivity is 9.97 pm/°C and it shows good linearity through the whole testing range. The new-type multimode interferometer is appropriate for high-accuracy gas RI detection of micrometer-scale spaces and wide-range temperature compensation can be realized.

Original languageEnglish (US)
Pages (from-to)1028-1032
Number of pages5
JournalApplied optics
Issue number6
DOIs
StatePublished - Feb 20 2014

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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