Open AccessDual channel multilayer-coated surface plasmon resonance sensor for dual refractive index range measurements
Author(s) -
Mengdi Lu,
Wei Peng,
Qiang Liu,
Yun Liu,
Lixia Li,
Yuzhang Liang,
JeanFrançois Masson
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.008563
Subject(s) - refractive index , materials science , surface plasmon resonance , optics , indium tin oxide , surface plasmon , optoelectronics , overlayer , total internal reflection , layer (electronics) , plasmon , nanotechnology , nanoparticle , chemistry , physics
We present a novel multilayer-coated surface plasmon resonance sensor for dual refractive index range measurements based on a capillary structure. The sensing elements include an internally coated Ag layer and an externally coated bilayer of Au with an overlayer of thin indium tin oxide (ITO). The internal Ag layer was sensitive to higher refractive index (RI) medium while the external Au/ITO layer was sensitive to lower refractive index medium. We evaluated the sensor performance by measuring RI changes in two channels, RI sensitivities were -1951 nm/RIU and 2496 nm/RIU, respectively. This compact, low-cost large RI detection range SPR sensor offers the possibility for wider RI detection range and highly sensitive SPR studies in industry and chemical sensing.