Liquid refractive index sensors using resonant optical tunneling effect for ultra-high sensitivity

A. Q. Jian, Xuming Zhang, W. M. Zhu, A. Q. Liu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

9 Citations (Scopus)


This paper reports the design and analysis of a liquid refractive index (RI) fiber sensor based on resonant optical tunneling effect (ROTE). The device utilizes an optical cavity formed between two angled silver-coated optical fibers to detect the RI changes by measuring the intensity variation of transmission intensity or the wavelength shift of transmission peak. The simulation results show that the intensity-based method could reach a sensitivity of 10-7RIU (refractive index unit) and the spectrum-based method promises a sensitivity of 81,000 nm/RIU, which are much larger than those of Fabry-Pérot etalons and surface plasmon resonance sensors. With ultrahigh sensitivity, pico-litre sample volume and fiber integration, this sensor may find potential applications in biochemical analysis.
Original languageEnglish
Pages (from-to)347-351
Number of pages5
JournalSensors and Actuators, A: Physical
Issue number2
Publication statusPublished - 1 Oct 2011


  • Refractive index sensor
  • Refractometry
  • Resonant optical tunneling effect

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering

Cite this