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

Volume

26

Issue

3

fYear

2014

fDate

Feb.1, 2014

Firstpage

239

Lastpage

241

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;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2013.2291298

Filename

6665009