Ultra-Sensitive Fiber Optic Gas Sensor Using Graphene Oxide Coated Long Period Gratings

Mandeep Singh, Sanjeev Kumar Raghuwanshi, Om Prakash

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)


In this letter, we develop two types of refractive index based sensors using single-mode fiber (SMF-28) to sense hazardous toxic gases in underground mines. The first sensor design is simply a graphene-oxide (GO) deposited long period grating (LPG) and second sensor consist of two LPGs with an interspacing distance of 1 cm (Δl) acting as Mach-Zehnder interferometer (MZI). In addition, we also confirm GO deposition on the SMF using ultraviolet-visible spectroscopy, atomic force microscopy (AFM), and field emission scanning electron micrograph (FESEM). Our experiment results show that the sensitivity of two-LPGs based fiber optic sensor (SLPG-2 = 76.32 dB/RIU) is higher as compared to the single LPG sensor (SLPG-1 = 54.65 dB/RIU). Hence, reported graphene oxide deposited long period grating sensor possess better sensitivity and can detect maximum 1.52× 10-5 index variation in the optical telecommunication band.

Original languageEnglish
Article number8786126
Pages (from-to)1473-1476
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number17
Publication statusPublished - 01-09-2019

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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