Publication: Controlled side coupling of light to cladding mode of ZnO nanorod coated optical fibers and its implications for chemical vapor sensing
Issued Date
2014-10-31
Resource Type
ISSN
09254005
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2-s2.0-84903148758
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Mahidol University
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SCOPUS
Bibliographic Citation
Sensors and Actuators, B: Chemical. Vol.202, (2014), 543-550
Suggested Citation
Tanujjal Bora, Hoorieh Fallah, Mayur Chaudhari, Thanit Apiwattanadej, Sulaiman W. Harun, Waleed S. Mohammed, Joydeep Dutta Controlled side coupling of light to cladding mode of ZnO nanorod coated optical fibers and its implications for chemical vapor sensing. Sensors and Actuators, B: Chemical. Vol.202, (2014), 543-550. doi:10.1016/j.snb.2014.05.097 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/33817
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Title
Controlled side coupling of light to cladding mode of ZnO nanorod coated optical fibers and its implications for chemical vapor sensing
Abstract
Controlled light coupling from surrounding to the cladding mode of zinc oxide (ZnO) nanorod coated multimode optical fiber induced by the light scattering properties of the nanorod coating and their applications of sensing are reported here. A dense and highly ordered array of ZnO nanorods is grown on the cladding of silica fibers by using low temperature hydrothermal process and the effect of the hydrothermal growth conditions of the nanorods on the light scattering and coupling to the optical fibers is experimentally investigated. The nanorod length and its number per unit area are found to be most crucial parameters for the optimum side coupling of light into the fibers. Maximum excitation of the cladding mode by side coupling of light is obtained with ZnO nanorods of length ∼2.2 μm, demonstrating average coupling efficiency of ∼2.65%. Upon exposure to different concentrations of various chemical vapors, the nanorod coated fibers demonstrated significant enhancement in the side coupled light intensity, indicating the potential use of these ZnO nanorod coated fibers as simple, low cost and efficient optical sensors. The sensor responses to methanol, ethanol, toluene and benzene vapor were investigated and compared, while the effect of humidity in the sensing environment on the sensor performance was explored as well. © 2014 Elsevier B.V.