Open AccessEngineering the magnetic plasmon resonances of metamaterials for high-quality sensing
Author(s) -
Jing Chen,
Wenfang Fan,
Tao Zhang,
Chaojun Tang,
Xingyu Chen,
Jingjing Wu,
Danyang Li,
Yu Ying
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.25.003675
Subject(s) - metamaterial , split ring resonator , resonator , figure of merit , plasmon , materials science , optics , diffraction , magnetic field , surface plasmon resonance , optoelectronics , physics , nanotechnology , nanoparticle , quantum mechanics
We present a powerful method to enhance the magnetic plasmon (MP) resonances of metamaterials composed of periodic arrays of U-shaped metallic split-ring resonators (SRRs) for high-quality sensing. We show that by suspending the metamaterials to reduce the effect of the substrate, the strong diffraction coupling of MP resonances can be achieved, which leads to a narrow-band mixed MP mode with a large magnetic field enhancement. It is also shown that for such a diffraction coupling, the magnetic field component of the lattice resonance mode of periodic arrays must be parallel to the induced magnetic moment in the metallic SRRs. Importantly, the sensitivity and the figure of merit (FOM) of the suspended metamaterials can reach as high as 1300 nm/RIU and 40, respectively. These results suggest that the proposed metamaterials may find great potential applications in label-free biomedical sensing.