Sensing characteristics of long period fiber grating functionalized with graphite oxide

Sheng-hui SHI; Xin WANG; Ming-fu ZHAO; De-cao WU; Bin-bin LUO

doi:10.3788/OPE.20192711.2305

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Sensing characteristics of long period fiber grating functionalized with graphite oxide

Modern Applied Optics | 更新时间：2020-08-13

- Sensing characteristics of long period fiber grating functionalized with graphite oxide
- Optics and Precision Engineering Vol. 27, Issue 11, Pages: 2305-2314(2019)
- 作者机构：
  
  1.重庆理工大学光纤传感与光电检测重庆市重点实验室，重庆 400054
  2.重庆理工大学智能光纤感知技术重庆市高校工程研究中心，重庆 400054
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20192711.2305
  CLC： TN253
- Received：16 May 2019，
  
  Accepted：26 June 2019，
  
  Published：15 November 2019
- 稿件说明：
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Sheng-hui SHI, Xin WANG, Ming-fu ZHAO, et al. Sensing characteristics of long period fiber grating functionalized with graphite oxide[J]. Optics and precision engineering, 2019, 27(11): 2305-2314.
DOI：

Sheng-hui SHI, Xin WANG, Ming-fu ZHAO, et al. Sensing characteristics of long period fiber grating functionalized with graphite oxide[J]. Optics and precision engineering, 2019, 27(11): 2305-2314. DOI： 10.3788/OPE.20192711.2305.

摘要

提出一种基于氧化石墨烯(GO)修饰的长周期光纤光栅(LPFG)传感器。利用氢氧化钠溶液对LPFG表面进行羟基化处理，采用氢键结合的方式使GO固定在光栅表面，形成基于GO修饰的LPFG传感器。实验研究了GO-LPFG对外部折射率及温度的响应特性，结果表明：该GO-LPFG的平均折射率灵敏度较未涂覆GO的LPFG提高1.09倍，温度灵敏度略有降低。随着光栅直径的减小，GO-LPFG的平均折射率灵敏度进一步提高。当光栅直径为108

m时，在折射率1.333~1.448内的平均波长和耦合强度折射率灵敏度分别约为38.99 nm/RIU和57.33 dB/RIU，与未采用GO修饰直径为108

m的LPFG及直径为125

m的GO-LPFG相比，其平均波长和耦合强度折射率灵敏度分别提高1.45，2.17，3.80和3.42倍。该GO-LPFG传感器在各种大分子量的病毒抗原蛋白、生物病菌等生物检测领域具有潜在的应用价值。

Abstract

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

m 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

m. 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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Related Institution

Chongqing Key Laboratory of Optical Fiber Sensor and Photoelectric Detection, Chongqing University of Technology

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School of Mechatronics and Vehicle Engineering， Chongqing Jiaotong University

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