Title :
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
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;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2013.2245117
