A Stable Evanescent Field-Based Microfiber Knot Resonator Refractive Index Sensor

Author

Xianli Li ; Hui Ding

Author_Institution

State Key Lab. of Electr. Insulation & Power Equip., Xii´an Jiaotong Univ., Xi´an, China

Volume

26

Issue

16

fYear

2014

fDate

Aug.15, 15 2014

Firstpage

1625

Lastpage

1628

Abstract

An evanescent field-based microfiber knot resonator (MKR) refractive index sensor with long-term stability was proposed in this letter. To protect the microfiber from the mechanical and optical degradation and at the same time preserve the large evanescent waves, a dip-coating technique was presented to coat the MKR and a thin coating in the submicrometer thickness range was experimentally fabricated. The temporal stability of the coated MKR and its sensing properties in refractive index were, respectively, investigated. The results indicated that the coated MKR did not degrade over a long time, and the minimal detectable refractive index of (2 times 10 ^{-4}) was successfully achieved.

Keywords

antireflection coatings; dip coating; fibre optic sensors; micro-optics; optical fibre fabrication; optical resonators; refractive index; coated MKR; dip-coating technique; large evanescent waves; long-term stability; mechanical degradation; minimal detectable refractive index; optical degradation; sensing properties; stable evanescent field-based microfiber knot resonator refractive index sensor; submicrometer thickness; temporal stability; thin coating; Coatings; Optical fiber sensors; Optical refraction; Optical surface waves; Optical variables control; Refractive index; Microfiber knot resonator; dip-coating technique; refractive index sensor;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2014.2329321

Filename

6826571