Refractive index sensor based on a gradient grating period guided-mode resonance

Chan Te Hsiung, Cheng-Sheng Huang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


In this letter, we introduce a novel refractive index sensor based on gradient grating period guided-mode resonance (GGP-GMR). Rather than a constant grating period, as in typical GMR, GGP-GMR comprises a grating period varying in increments of 2 nm. For grating variation from 386 to 392 nm, a detection range of 0.109 RIU with a bulk sensitivity of 1433.7 μm/RIU and theoretical and experimental detection limits of 5.58 × 10 -3 and 10 -2 RIU, respectively, can be achieved. Several tactics that can be readily adopted are suggested to improve the limit of detection by an order of 10 -4 RIU, sufficient for detecting many clinically relevant biomarkers. The readout system requires a narrow band of light and a simple charge-coupled device combined with the compact design of the GGP-GMR sensor, which eases the miniaturization of the system for handheld devices as well as its integration with smartphones.

Original languageEnglish
Article number8601411
Pages (from-to)253-256
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number3
StatePublished - 1 Feb 2019


  • Bandstop filter
  • guided-mode resonance
  • subwavelength nanostructure


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