Title :
FIB-Milled Gold-Coated Singlemode-Multimode- Singlemode Fiber Tip Refractometer
Author :
Ming Ding ; Pengfei Wang ; Junlong Wang ; Brambilla, Gilberto
Author_Institution :
Optoelectron. Res. Centre, Univ. of Southampton, Southampton, UK
Abstract :
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.
Keywords :
fibre optic sensors; focused ion beam technology; gold; milling; optical fibre fabrication; refractive index; refractometers; Au; FIB-milled gold-coated singlemode-multimode-singlemode fiber tip refractometer; RIU; SMST; average sensitivity; biological sensing; chemical sensing; clean fiber tip cut; compact singlemode-multimode-singlemode fiber tip refractive index sensor; fabrication ease; focused ion beam milling; gold layer; in-fiber optical component; light reflection; linear response; resolvable index change; sensor sensitivity; Optical fiber sensors; Optical fibers; Optimized production technology; Refractive index; Sensitivity; Temperature measurement; Refractive index sensor; compact size; focused ion beam; singlemode-multimode-singlemode;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2013.2291298
