Temperature-insensitive fiber-optic refractometer based on immobilization of polydimethilsiloxane film

Bing Sun, Fei Li, Kandi Xu, Kaiming Zhou, Zuxing Zhang

Research output: Contribution to journalArticlepeer-review


A temperature-insensitive fiber refractometer, which consists of a simple single-mode–multimode–single-mode fiber optic scheme, is theoretically proposed and experimentally demonstrated. The multimode section involves with a segment of D-shaped no core fiber (Ds-NCF) while the surface of the Ds-NCF is partially coated with a thin layer of polydimethylsiloxane (PDMS) film. Owing to the opposite thermo-optic coefficients (TOC) of the silica and the PDMS film, a compact structure with nearly zero temperature dependence is fabricated. Moreover, such refractometer benefits from simplicity and low-cost and achieves competitive refractive index sensitivities of 140.1 nm/RIU in the range of 1.32 to 1.37, and_1147 nm/RIU over a RI range from 1.38 to 1.44. These excellent characteristics would find wide potential applications, such as chemical detection, biological detection, medical field and other fields.
Original languageEnglish
Pages (from-to)165-168
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number3
Early online date20 Jan 2022
Publication statusPublished - 1 Feb 2022


  • Coatings
  • Interferometers
  • Optical fiber polarization
  • Optical fiber sensors
  • Refractive index
  • Sensitivity
  • Temperature dependence
  • Temperature measurement
  • Temperature sensor
  • Temperature sensors


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