Sensitive refractive index sensor based on an assembly-free fiber multi-mode interferometer fabricated by femtosecond laser

Pengcheng Chen, Xuewen Shu*, Fangcheng Shen, Haoran Cao

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

We propose and demonstrate a highly sensitive refractive index (RI) sensor based on a novel fiber-optic multi-mode interferometer (MMI), which is formed with a femtosecond-laser-induced in-core negative refractive index modified line in a standard single mode fiber. The proposed MMI structure is directly written with femtosecond laser in one step, which removes the splicing process needed in conventional MMI fabrication and also significantly improves the robustness. This device exhibits a high sensitivity to surrounding refractive index, with a maximum sensitivity up to 10675.9 nm/RIU at the RI range of 1.4484-1.4513. The distinct advantages of high sensitivity, compact, robust and assembly-free all-fiber structure make it attractive for real physical, chemical and biological sensing.

Original languageEnglish
Pages (from-to)29896-29905
Number of pages10
JournalOptics Express
Volume25
Issue number24
DOIs
Publication statusPublished - 27 Nov 2017

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