Optics and Precision Engineering, Volume. 27, Issue 11, 2305(2019)
Sensing characteristics of long period fiber grating functionalized with graphite oxide
A graphene oxide-functionalized long period fiber grating (GO-LPFG)-based fiber optic sensor is proposed. The surface of the LPFG was hydroxylated by sodium hydroxide solution, and GO was fixed on the grating surface by hydrogen bonding to form a GO modification LPFG sensor. The responses of the GO-LPFG to external refractive index and temperature were studied experimentally. The experimental results show that the average refractive index sensitivity of the GO-LPFG is 1.09 times higher than that of uncoated LPFG, and the temperature sensitivity slightly declines. With the decrease of grating diameter, the average refractive index sensitivity of GO-LPFG was further improved. The average wavelength and coupling intensity refractive index sensitivities of the GO-LPFG with a diameter of 108 μm in the refractive index range of 1.333-1.448 are ~38.99 nm/RIU and ~57.33 dB/RIU, respectively. These increased by 1.45, 2.17 and 3.80, 3.42 times, respectively, compared with those of bare LPFG and GO-LPFG with diameter of 125 μm. The proposed GO-LPFG sensor has potential applications in detecting various viral antigen proteins with high molecular weight and biological pathogens in biofields.
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SHI Sheng-hui, WANG Xin, ZHAO Ming-fu, WU De-cao, LUO Bin-bin. Sensing characteristics of long period fiber grating functionalized with graphite oxide[J]. Optics and Precision Engineering, 2019, 27(11): 2305
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Received: May. 16, 2019
Accepted: --
Published Online: Jan. 7, 2020
The Author Email: Sheng-hui SHI (shshill@cqut.edu.cn)