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FIB-Milled Gold-Coated Singlemode-Multimode- Singlemode Fiber Tip Refractometer

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4 Author(s)
Ming Ding ; Optoelectron. Res. Centre, Univ. of Southampton, Southampton, UK ; Pengfei Wang ; Junlong Wang ; Gilberto Brambilla

A compact singlemode-multimode-singlemode fiber tip (SMST) refractive index sensor is demonstrated. Focused ion beam milling is exploited to have a clean fiber tip cut which is then coated by a layer of gold to increase reflection. An average sensitivity of 265 nm/RIU and a resolvable index change of 3.77×10-5 are obtained experimentally with a ~ 2.94 μm diameter SMST. Because of its compactness, ease of fabrication, linear response, good sensitivity, easy connectivity to other in-fiber optical components, and low cost, this refractometer could find various applications in chemical and biological sensing.

Published in:

IEEE Photonics Technology Letters  (Volume:26 ,  Issue: 3 )