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

Singh, Mandeep and Raghuwanshi, Sanjeev Kumar and Prakash, Om (2019) Ultra-Sensitive Fiber Optic Gas Sensor Using Graphene Oxide Coated Long Period Gratings. In: IEEE PHOTONICS TECHNOLOGY LETTERS, 31 (17). pp. 1473-1476.

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Official URL: https://dx.doi.org/10.1109/LPT.2019.2932764


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 (Delta l) 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 x 10(-5) index variation in the optical telecommunication band.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Keywords: Fiber optic sensor; long period grating; graphene oxide; Kramers-Kronig; Mach Zehnder Interferometer
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Depositing User: Id for Latest eprints
Date Deposited: 20 Nov 2019 05:51
Last Modified: 20 Nov 2019 05:51
URI: http://eprints.iisc.ac.in/id/eprint/63583

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