Refractive Index Sensing Based on the Reflectivity of the Backward Cladding-Core Mode Coupling in a Concatenated Fiber Bragg Grating and a Long Period Grating

2012 ◽  
Vol 12 (5) ◽  
pp. 1415-1420 ◽  
Author(s):  
Ming-Yue Fu
Keyword(s):  
Refractive Index ◽  
Fiber Bragg Grating ◽  
Mode Coupling ◽  
Bragg Grating ◽  
Core Mode ◽  
Long Period Grating ◽  
Long Period ◽  
Refractive Index Sensing

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.

Strain/Temperature Discrimination Using Combined Fiber Bragg Grating and Long Period Grating Sensors

1996 ◽  
Author(s):  
H. Patrick ◽  
G. M. Williams ◽  
A. D. Kersey ◽  
J. R. Pedrazzani ◽  
A. M. Vengsarkar
Keyword(s):  
Fiber Bragg Grating ◽  
Bragg Grating ◽  
Long Period Grating ◽  
Long Period
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