Fiber Optic Refractometer Based on Cladding Excitation of Localized Surface Plasmon Resonance

Author

Zhi Qiang Tou ; Chi Chiu Chan ; Wei Chang Wong ; Li Han Chen

Author_Institution

Div. of Bioeng., Nanyang Technol. Univ., Singapore, Singapore

Volume

25

Issue

6

fYear

2013

fDate

15-Mar-13

Firstpage

556

Lastpage

559

Abstract

A fiber optic refractometer based on a novel configuration to excite localized surface plasmon resonance is demonstrated. The fiber sensor consists of a short segment of photonic crystal fiber (PCF) fusion spliced between multimode fibers. Evanescent field of cladding modes excite gold nanoparticles (AuNPs) immobilized on the PCF surface. The proposed sensor offers ease of fabrication, when normalized transmitted intensity is used to quantify external bulk refractive index (RI), sensitivity of -731%/RIU, limit of detection of 1.76×10^-5 RIU can be achieved with high linearity (r²=0.9988) over RI range from 1.33 to 1.43 RIU.

Keywords

fibre optic sensors; holey fibres; optical fibre cladding; photonic crystals; refractometers; surface plasmon resonance; cladding excitation; fiber optic refractometer; fiber sensor; localized surface plasmon resonance; multimode fibers; photonic crystal fiber fusion; quantify external bulk refractive index; Optical fiber sensors; Optical fiber theory; Plasmons; Refractive index; Sensitivity; Surface treatment; Gold nanoparticles; localized surface plasmon resonance (LSPR); optical fiber sensor;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2013.2245117

Filename

6450053