Open AccessA multi-functional plasmonic biosensor
Author(s) -
Yun-Tzu Chang,
Yueh-Chun Lai,
Chung-Tien Li,
Cheng-Kuang Chen,
TaJen Yen
Publication year - 2010
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.009561
Subject(s) - refractive index , plasmon , optics , materials science , biosensor , resonator , dielectric , split ring resonator , sensitivity (control systems) , optoelectronics , surface plasmon resonance , nanotechnology , physics , nanoparticle , electronic engineering , engineering
We present a coupler-free, multi-mode refractive index sensor based on nanostructured split ring resonators (SRRs). The fabricated SRR structures exhibit multiple reflectance peaks, whose spectral positions are sensitive to local dielectric environment and can be quantitatively described by our standing-wave plasmonic resonance model, providing a design rule for this multi-mode refractive-index (MMRI) sensor. We further manifest that the lower-order modes possess greater sensitivity associated with stronger localized electromagnetic field leading to shorter detection lengths within five hundreds nanometers, while the higher-order modes present mediate sensitivity with micron-scale detection lengths to allow intracellular bio-events detection. These unique merits enable the SRR-based sensor a multi-functional biosensor and a potential label-free imaging device.