A Novel Hydrogen Sensor Based on a Guided-Mode Resonance Filter

Yi Ming Lin, Jing Jhong Gao, Kuo Ping Chen, Chih Hsiang Huang, Cheng Sheng Huang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, we demonstrated a hydrogen (H2) sensor based on a guided-mode resonance (GMR) filter coated with a layer of palladium (Pd). The sensor consists of three key layers, namely the substrate (replicated grating structure on an optical adhesive), waveguiding layer of TiO2, and active-sensing layer of Pd. The sensor functions as an optical resonator. On absorption of H2, the change of the refractive index in Pd changes the optical response of the sensor. To monitor the output optical response, a transmission setup was used, and two detection modalities-the change in transmission efficiency at a specific wavelength and the shift in the resonant wavelength-were demonstrated. Upon injection of a mixture of 4% H2 and 96% argon, the resonant wavelength shifted 6.38 nm, and transmission efficiency increased by 45% in 24 s.

Original languageEnglish
Article number9194718
Pages (from-to)2798-2804
Number of pages7
JournalIEEE Sensors Journal
Volume21
Issue number3
DOIs
StatePublished - 1 Feb 2021

Keywords

  • Grating
  • guided-mode resonance
  • hydrogen sensor
  • subwavelength structure

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