Open AccessCladding Modified Fiber Bragg Grating for Copper Ions Detection
Author(s) -
Husam Abduldaem Mohammed,
Aqiel Almamori,
Ali Abdulkhaleq Alwahib
Publication year - 2021
Publication title -
semiconductor science and information devices
Language(s) - English
Resource type - Journals
ISSN - 2661-3212
DOI - 10.30564/ssid.v3i2.3749
Subject(s) - fiber bragg grating , cladding (metalworking) , materials science , hydrofluoric acid , wavelength , copper , ion , aqueous solution , metal ions in aqueous solution , optics , fiber optic sensor , optoelectronics , fiber , metal , chemistry , composite material , physics , organic chemistry , metallurgy
This paper reports a fiber Bragg grating (FBG) as a biosensor. The FBGs were etched using a chemical agent,namely,hydrofluoric acid (HF). This implies the removal of some part of the cladding layer. Consequently, the evanescent field propagating out of the core will be closer to the environment and become more sensitive to the change in the surrounding. The proposed FBG sensor was utilized to detect toxic heavy metal ions aqueous medium namely, copper ions (Cu2+). Two FBG sensors were etched with 20 and 40 μm diameters and fabricated. The sensors were studied towards Cu2+ with different concentrations using wavelength shift as a result of the interaction between the evanescent field and copper ions. The FBG sensors showed a good response in terms of significant wavelength shift in corresponding to varying Cu2+ concentrations when immersed in aqueous mediums. The sensors exhibited excellent repeatability towards Cu ions.The results demonstrate that the smaller FBG etching diameter, the better optical response in terms of wavelength and linearity.