Simultaneous measurement of refractive index and temperature using a SPR-based fiber optic sensor

Jesús Salvador Velázquez-González, David Monzón-Hernández, David Moreno-Hernández, Fernando Martínez-Piñón, Iván Hernández-Romano

Research output: Contribution to journalArticlepeer-review

182 Scopus citations

Abstract

A surface plasmon resonance-based fiber-optic sensor for simultaneous measurement of refractive index and temperature of liquid samples is proposed and experimentally demonstrated. The sensor consists of a gold-coated MM-SM-MM optical fiber structure, whose sensitive section was partially covered with polydimethylsiloxane (PDMS) to generate two independent SPR resonance dips in the fiber transmission spectrum. One of the dips is generated by the bare gold-coated fiber section whose wavelength resonance is tuned by the refractive index and temperature of the surrounding medium. The other dip that is exclusively used to monitor the temperature variations of the liquid sample, whose central wavelength at 900 nm corresponds to PDMS refractive index at 20 °C, is produced by the polymerized gold-coated fiber section. The high refractive index and temperature sensitivity achieved, 2323.4 nm/RIU and −2.850 nm/°C respectively, the small size, the ease fabrication process, and the bio-compatibility of the proposed device are appealing characteristics that makes it ideal for practical bio-sensing applications.

Original languageEnglish
Pages (from-to)912-920
Number of pages9
JournalSensors and Actuators, B: Chemical
Volume242
DOIs
StatePublished - 2017

Keywords

  • Metal deposition
  • Optical fiber sensors
  • Polydimethylsiloxane (PDMS)
  • Refractive index and temperature sensing
  • Surface plasmon resonance

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