Thin-Core Fiber Taper-Based Multi-Mode Interferometer for Refractive Index Sensing

Yujie Kong, Xuewen Shu*, Haoran Cao, Jiancheng Deng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We demonstrate a thin-core fiber (TCF)-based hybrid modal interferometer for high-sensitivity refractive index (RI) sensing. It mainly consists of a tapered TCF with an air bubble fabricated by the arc discharge technique using a fusion splicer machine. Due to mode mismatch and the tapering of the TCF, high-order cladding modes are excited, which can be used for high-sensitivity index sensing. The selected two interference dips of the sensor can obtain the index sensitivities of 370.37 and-72.22 dB/RIU in the RI range from 1.333 to 1.3799. Using the differential intensity demodulation method, a total index sensitivity as high as 442.59 dB/RIU can be achieved. Featured with high sensitivity, linear response, small size, ease of fabrication, and low cost, the proposed sensor may have various applications in biochemical sensing field.

Original languageEnglish
Article number8453892
Pages (from-to)8747-8754
Number of pages8
JournalIEEE Sensors Journal
Issue number21
Early online date3 Sept 2018
Publication statusPublished - 1 Nov 2018


  • optical fiber sensors
  • Refractive index


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