Deep subwavelength fourfold rotationally symmetric split-ring-resonator metamaterials for highly sensitive and robust biosensing platform.
Metamaterials provide a good platform for biochemical sensing due to its strong field localization at nanoscale. In this work, we show that electric and magnetic resonant modes in split-ring-resonator (SRR) can be efficiently excited under unpolarized light illumination when the SRRs are arranged in fourfold rotationally symmetric lattice configuration. The fabrication and characterization of deep subwavelength (~λ/15) gold-based SRR structures with resonator size as small as ~ 60 nm are reported with magnetic resonances in Vis-NIR spectrum range. The feasibility for sensing is demonstrated with refractive index sensitivity as high as ~ 636 nm/RIU.
OPTIMUS, Photonics Centre of Excellence, School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798.
Landobasa Y M
LY
Tobing
Liliana
L
Tjahjana
Dao Hua
DH
Zhang
Qing
Q
Zhang
Qihua
Q
Xiong
D015374:Biosensing Techniques / Q000295:instrumentation*; D004560:Electricity; D006046:Gold / Q000737:chemistry*; D008027:Light; D060328:Magnetic Phenomena; D012031:Refractometry; D012399:Rotation
D006046:Gold