Anomalous refractive index of ultrathin gold nanoparticle film coated on tilted fiber Bragg grating

2014 ◽  
Author(s):  
Wenjun Zhou ◽  
David J. Mandia ◽  
Matthew B. E. Griffiths ◽  
Seán T. Barry ◽  
Jacques Albert
Keyword(s):  
Refractive Index ◽  
Fiber Bragg Grating ◽  
Gold Nanoparticle ◽  
Bragg Grating ◽  
Nanoparticle Film

Development of an Optical Fiber Sensor with a D-shaped Fiber Bragg Grating Integrated in a Loop-mirror Optical Fiber Laser as a High Sensitivity Refractometer

2021 ◽  
Vol 32 ◽  
Author(s):  
Binh Pham Thanh ◽  
Thuy Van Nguyen ◽  
Van Hoi Pham ◽  
Huy Bui ◽  
Thi Hong Cam Hoang ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Fiber Laser ◽  
Fiber Bragg Grating ◽  
Limit Of Detection ◽  
Optical Fiber Sensor ◽  
High Sensitivity ◽  
Optical Signal ◽  
Bragg Grating ◽  
Loop Mirror

In this paper, we report a new type of refractometer based on a D-shaped fiber Bragg grating (FBG) integrated in a loop-mirror optical fiber laser. This proposed sensor is used in wavelength interrogation method, in which the D-shaped FBG is applied as a refractive index (RI) sensing probe and a mirror to select mode of laser. The D-shaped FBG is prepared by the removal of a portion of the fiber cladding covering the FBG by means of side-polishing technique. The D-shaped FBG sensing probe integrated in a loop-mirror optical fiber laser with saturated pump technique, the characteristics of sensing signals have been improved to obtain stable intensity, narrower bandwidth and higher optical signal-to-noise ratio compare to normal reflection configuration. The limit of detection (LOD) of this sensor can be achieved to 2.95 x 10-4 RIU in the refractive index (RI) range of 1.42-1.44. Accordingly, we believe that the proposed refractometer has a huge potential for applications in biochemical-sensing technique.

Refractive Index and Temperature Sensor Based on D-Shaped Fiber Combined With a Fiber Bragg Grating

2019 ◽  
Vol 19 (4) ◽  
pp. 1362-1367 ◽  
Author(s):  
Yue Dong ◽  
Shiying Xiao ◽  
Beilei Wu ◽  
Han Xiao ◽  
Shuisheng Jian
Keyword(s):  
Refractive Index ◽  
Fiber Bragg Grating ◽  
Temperature Sensor ◽  
Bragg Grating

Theoretical Model and Design of Single-End Etched Fiber Bragg Grating in Low Refractive-Index Area

2011 ◽  
Vol 31 (4) ◽  
pp. 0406004 ◽  
Author(s):  
罗彬彬 Luo Binbin ◽  
赵明富 Zhao Mingfu ◽  
周晓军 Zhou Xiaojun ◽  
黄德翼 Huang Deyi ◽  
曹雪梅 Cao Xuemei
Keyword(s):  
Refractive Index ◽  
Theoretical Model ◽  
Fiber Bragg Grating ◽  
Bragg Grating ◽  
Low Refractive Index

Dual-Wavelength Sampled Fiber Bragg Grating by Changing Refractive Index of Fiber

2012 ◽  
Vol 39 (4) ◽  
pp. 0405001
Author(s):  
孙帼丹 Sun Guodan ◽  
王荣 Wang Rong ◽  
蒲涛 Pu Tao ◽  
魏志虎 Wei Zhihu
Keyword(s):  
Refractive Index ◽  
Fiber Bragg Grating ◽  
Dual Wavelength ◽  
Bragg Grating ◽  
Sampled Fiber Bragg Grating

scholarly journals Etched Fiber Bragg Grating Biosensor Functionalized with Aptamers for Detection of Thrombin

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4298 ◽  
Author(s):  
Aliya Bekmurzayeva ◽  
Kanat Dukenbayev ◽  
Madina Shaimerdenova ◽  
Ildar Bekniyazov ◽  
Takhmina Ayupova ◽  
...  
Keyword(s):  
Refractive Index ◽  
Fiber Bragg Grating ◽  
Chemical Vapor ◽  
Bragg Grating ◽  
Clinical Settings ◽  
Long Period Grating ◽  
Bragg Wavelength ◽  
Sensing System ◽  
Index Unit

A biosensor based on an etched Fiber Bragg Grating (EFBG) for thrombin detection is reported. The sensing system is based on a Fiber Bragg Grating (FBG) with a Bragg wavelength of 1550 nm, wet-etched in hydrofluoric acid (HF) for ~27 min, to achieve sensitivity to a refractive index (RI) of 17.4 nm/RIU (refractive index unit). Subsequently, in order to perform a selective detection of thrombin, the EFBG has been functionalized with silane-coupling agent 3-(aminopropyl)triethoxysilane (APTES) and a cross-linker, glutaraldehyde, for the immobilization of thrombin-binding aptamer. The biosensor has been validated for thrombin detection in concentrations ranging from 10 nM to 80 nM. The proposed sensor presents advantages with respect to other sensor configurations, based on plasmonic resonant tilted FBG or Long Period Grating (LPG), for thrombin detection. Firstly, fabricating an EFBG only requires chemical etching. Moreover, the functionalization method used in this study (silanization) allows the avoidance of complicated and expensive fabrications, such as thin film sputtering or chemical vapor deposition. Due to their characteristics, EFBG sensors are easier to multiplex and can be used in vivo. This opens new possibilities for the detection of thrombin in clinical settings.

Refractive index measurement based on fiber Bragg grating connected with a multimode fiber core

2015 ◽  
Vol 351 ◽  
pp. 70-74 ◽  
Author(s):  
Min Shao ◽  
Xueguang Qiao ◽  
Zhenan Jiasurname ◽  
Haiwei Fusurname ◽  
Yinggang Liu ◽  
...  
Keyword(s):  
Refractive Index ◽  
Fiber Bragg Grating ◽  
Bragg Grating ◽  
Multimode Fiber ◽  
Refractive Index Measurement ◽  
Fiber Core ◽  
Index Measurement
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