A high sensitivity refractometer based on a tapered SCSMF structure and its application to biosensing

Qiang Wu; Youqiao Ma; Yuliya Semenova; Jinhui Yuan; Lin Bo; Pengfei Wang; Xinzhu Sang; Mianzhen Teng; Chongxiu Yu; Christy Charlton O'Mahony; Gerald Farrell

doi:10.1117/12.2059270

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2 June 2014 A high sensitivity refractometer based on a tapered SCSMF structure and its application to biosensing

Qiang Wu, Youqiao Ma, Yuliya Semenova, Jinhui Yuan, Lin Bo, Pengfei Wang, Xinzhu Sang, Mianzhen Teng, Chongxiu Yu, Christy Charlton O'Mahony, Gerald Farrell

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Proceedings Volume 9157, 23rd International Conference on Optical Fibre Sensors; 91574U (2014) https://doi.org/10.1117/12.2059270
Event: OFS2014 23rd International Conference on Optical Fiber Sensors, 2014, Santander, Spain

Abstract

A high sensitivity refractive index (RI) sensor based on a tapered small core singlemode fibre (SCSMF) structure is proposed and developed. By tapering the SCSMF section, this sensor has very high sensitivity around the RI of water. Experimentally we have demonstrated a sensitivity of 1988.5 nm/RIU (RI unit) in the RI range from 1.3325 to 1.3407 by tapering a SCSMF section from a diameter of 125 μm to a diameter of 16 μm. The feasibility of using this type of sensor for biosensing application has also been verified by experiments. This was undertaken using a suitable Fibrinogen antigen surface functionalisation, which successfully showed that the sensor can in principle detect differences in the concentration of a Fibrinogen antibody.

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Qiang Wu, Youqiao Ma, Yuliya Semenova, Jinhui Yuan, Lin Bo, Pengfei Wang, Xinzhu Sang, Mianzhen Teng, Chongxiu Yu, Christy Charlton O'Mahony, and Gerald Farrell "A high sensitivity refractometer based on a tapered SCSMF structure and its application to biosensing", Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 91574U (2 June 2014); https://doi.org/10.1117/12.2059270

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