Deep subwavelength fourfold rotationally symmetric split-ring-resonator metamaterials for highly sensitive and robust biosensing platform

作者：Tobing Landobasa Y M^*; Tjahjana Liliana; Zhang Dao Hua; Zhang Qing; Xiong Qihua

来源：Scientific Reports, 2013, 3(1): 2437.

DOI：10.1038/srep02437

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 (similar to lambda/15) gold-based SRR structures with resonator size as small as similar to 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 similar to 636 nm/RIU.

• 出版日期2013-8-14