Citation
Mustapha Kamil, Yasmin and Mustapa, Mohd Azmir and Abu Bakar, Muhammad Hafiz and Musa, Baktiar and Amir Hamzah, Amir Syahir and Yaacob, Mohd Hanif and Mahdi, Mohd Adzir
(2015)
Refractive index sensor with asymmetrical tapered fiber based on evanescent field sensing.
In: 2015 IEEE International Broadband and Photonics Conference (IBP), 23-25 Apr. 2015, Bali, Indonesia. (pp. 35-39).
Abstract
We report and demonstrate a single-mode asymmetric tapered fiber as a refractive index (RI) sensor based on evanescent field sensing. The proposed setup managed to sense the changes of RI when the tapered region was exposed to different concentrations of Sodium chloride (NaCl). This was possible due to the output interference spectrum shifting in response to the changes of RI. Different environmental sensitivities were achieved by manipulating the transition lengths of the tapered fiber. Experimental results depict RI sensitivities of 3914.7 nm/RIU (refractive index unit) and 3395.7 nm/RIU for taper profiles with down-taper transition lengths of 2 mm and 8 mm, respectively, which is higher than previously reported asymmetric taper RI sensors. Such findings may find itself beneficial in low cost, reliable and simplified sensors.
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