Detection of chemicals using a novel fiber-optic sensor element built in fiber loop ring-resonators

Year: 2015

Authors: Gangopadhyay T. K., Giorgini A., Halder A., Pal M., Paul M.C., Avino S., Gagliardi G.

Autors Affiliation: CSIR, CGCRI, Fiber Opt & Photon Div, Kolkata 700032, India; CNR, INO, I-80125 Naples, Italy.

Abstract: We developed an evanescent field access block (EAB) sensor with an etched single mode fiber, fabricated with a core diameter of 8 µm and reduced cladding diameter down to 11 µm by hydrofluoric acid (HF) etching technique. Here, we describe the manufacturing process of the packaged sensor block and demonstrate that the sensor is able to detect sample absorption and refractive index (RI) changes. The sensor is tested with different chemical solutions such as ethylenediamine (EDA), dimethyl sulfoxide (DMSO) and ethanol (C2H5OH). At the same time, we fabricated (at CSIR-CGCRI) high quality optical fiber couplers having low splitting ratios (99.5:0.5%), which we used to build a 4 m long optical evanescent-wave fiber ring cavity with an embedded EAB. After a careful analysis of the fiber loop characteristics, we performed cavity ring-down measurements in order to detect the presence of liquid samples on the EAB.

Journal/Review: SENSORS AND ACTUATORS B-CHEMICAL

Volume: 206      Pages from: 327  to: 335

More Information: The authors would like to acknowledge the support of the Director, CGCRI, Scientists and staff members of Fibre Optics and Photonics Division, CGCRI, Kolkata, India. The research is partly funded by CSIR-CGCRI in-house project (Grant no. OLP0301) and INDO-ITALY Bilateral S&T programme (Grant no. ISTAD budget head P–80102). The authors would also like to acknowledge Dr. Paolo De Natale, Director, CNR-INO, Florence and Dr. Pietro Ferraro, in charge of CNR-INO, Naples, for their invaluable support to the project and allowing a joint collaborative research work. The authors would also like to thank CSIR authority, Delhi for the permission in CSIR, India-CNR, Italy Bilateral S&T programme 2009–2011.
KeyWords: Chemical detection; Chemical sensors; Dimethyl sulfoxide; Etching; Evanescent fields; Fiber optic sensors; Hydrofluoric acid; Light measurement; Optical fiber fabrication; Optical resonators; Organic solvents; Refractive index; Single mode fibers, Chemical etching; Chemical solutions; Detection of chemicals; Dimethyl sulfoxide (DMSO); Evanescent field absorptions; Manufacturing process; Optical fiber coupler; Ring resonator; Fiber
DOI: 10.1016/j.snb.2014.09.024

Citations: 13
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