A fiber tip refractive index sensor using FIB-milled gold-coated singlemode-multimode-singlemode structure

Ming Ding; Pengfei Wang; Junlong Wang; Heng Yuan; Gilberto Brambilla

doi:10.1117/12.2059382

2 June 2014 A fiber tip refractive index sensor using FIB-milled gold-coated singlemode-multimode-singlemode structure

Ming Ding, Pengfei Wang, Junlong Wang, Heng Yuan, Gilberto Brambilla

Proceedings Volume 9157, 23rd International Conference on Optical Fibre Sensors; 915781 (2014) https://doi.org/10.1117/12.2059382
Event: OFS2014 23rd International Conference on Optical Fiber Sensors, 2014, Santander, Spain

Abstract

A compact fiber tip refractive index sensor using FIB-milled gold-coated singlemode-multimode-singlemode structure is demonstrated. Focused ion beam (FIB) is exploited to cut the fiber tip to obtain a flat end-face and then a layer of gold is coated on the tip surface, to increase its reflection. An average sensitivity of 265 nm/RIU is obtained experimentally with a ~2.94 μm diameter singlemode-multimode-singlemode fiber tip (SMST). Because of several advantages, including compactness, ease of fabrication, linear response, high sensitivity, easy connection with other fiberized optical components and low cost, this refractive index sensor could find various applications in chemical and biological area.

Citation Download Citation

Ming Ding, Pengfei Wang, Junlong Wang, Heng Yuan, and Gilberto Brambilla "A fiber tip refractive index sensor using FIB-milled gold-coated singlemode-multimode-singlemode structure", Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 915781 (2 June 2014); https://doi.org/10.1117/12.2059382

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