Measurements of refractive index sensitivity using long-period grating refractometer

Joo Hin Chong, Ping Shum, H. Haryono, A. Yohana, M. K. Rao, Chao Lu, Yinian Zhu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

184 Citations (Scopus)


We report the development and demonstration of a long-period grating refractometer. The principle of operation is based on the using of a long-period grating that is structurally induced by a CO2laser, and where the resonance wavelengths are shifted as the refractive index of medium surrounding the cladding of the long-period grating. The different concentrations for three types of solutions (ethylene glycol, salt, and sugar) were experimentally measured, and results show that, as a refractometer, this fiber-based device not only can differentiate chemicals based on their refractive index, but it can also become a concentration indicator of a particular chemical solution, and applied in the oil and petroleum industry.
Original languageEnglish
Pages (from-to)65-69
Number of pages5
JournalOptics Communications
Issue number1-6
Publication statusPublished - 2 Jan 2004
Externally publishedYes


  • Concentrations in solutions
  • Fiber Bragg grating
  • Long-period grating
  • Refractive index
  • Refractometer
  • Sensitivity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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