Singh, Mandeep and Raghuwanshi, Sanjeev Kumar and Prakash, Om (2019) Ultra-Sensitive Fiber Optic Gas Sensor Using Graphene Oxide Coated Long Period Gratings. Ieee photonics technology letters, 31 (17). pp. 1473-1476. ISSN 1041-1135

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Abstract

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 (�l) acting as Mach-Zehnder interferometer (MZI). In addition, we also confirm GO deposi�tion 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.

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