Title :
Analysis of Phase Interrogated SPR Fiber Optic Sensors With Bimetallic Layers
Author :
Moayyed, Hamed ; Teixeira Leite, Ivo ; Coelho, Luis ; Santos, Jose Luis ; Viegas, Diana
Author_Institution :
Inst. de Eng. de Sist. e Comput.-Tecnol. e Cienc., Porto, Portugal
Abstract :
An effective analytical model combining geometrical optics with the transfer-matrix theory for stratified optical media is applied to investigate the sensing properties of tapered optical fiber surface plasmon resonance (SPR) sensors incorporating Ag-Au bimetallic layers, particularly in the context of phase interrogation. The performance of the sensing structures is studied as a function of the tapering parameters and thickness of the metallic layers. It is shown that the Ag-Au bimetallic combination is capable of improving the resolution and tuning working region of SPR fiber-optic sensors and that by tapering the sensing structures enhanced sensitivity can be achieved when phase interrogation is considered.
Keywords :
bimetals; fibre optic sensors; geometrical optics; gold; inhomogeneous media; optical tuning; silver; surface plasmon resonance; Ag-Au; bimetallic layer; geometrical optics; phase interrogated SPR fiber optic sensor analysis; stratified optical media; tapered optical fiber surface plasmon resonance sensor; transfer-matrix theory; Optical fiber sensors; Optical fibers; Plasmons; Refractive index; Sensitivity; Surface plasmon resonance; bimetallic combination; fiber-optic sensors; phase interrogation; tapered optical fibers;
Journal_Title :
Sensors Journal, IEEE
DOI :
10.1109/JSEN.2014.2329918