A Long-Period Grating Refractometer: Measurements of Refractive Index Sensitivity

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

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

8 Citations (Scopus)


We report the development and demonstration of a long-period grating refractometer. The principle of operation is based on in the using of a long-period grating that is structurally induced by a CO 2 laser, 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
Title of host publicationSBMO/IEEE MTT-S International Microwave and Optoelectronics Conference Proceedings
Number of pages4
Publication statusPublished - 1 Dec 2003
Externally publishedYes
Event2003 SMBO/IEEE MTT-S International Microwave and Optoelectronics Conference - IMOC 2003 - Foz do Iguacu, Brazil
Duration: 20 Sep 200323 Sep 2003


Conference2003 SMBO/IEEE MTT-S International Microwave and Optoelectronics Conference - IMOC 2003
CityFoz do Iguacu


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

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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