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Nature Research, Scientific Reports, 1(3), 2013

DOI: 10.1038/srep02437

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

Journal article published in 2013 by Landobasa Y. M. Tobing, Liliana Tjahjana, Dao Hua Zhang, Qing Zhang, Qihua Xiong
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

AbstractMetamaterials 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.