Fabrication and Characterization of Large Area Metallic Nano-Split-Ring   Arrays by Nanoimprint Lithography
  This paper presents a novel method to parallel fabricate large area (wafer scale) metallic nano-split-ring arrays with nanoimprint lithography (NIL). To our knowledge it is the first method that can pattern large area and high dense metallic split-ring arrays with advantages of high throughput, low-cost and simplicity. This method makes metallic nano-split-ring arrays, which was somehow conceptual before, practically useful. The optical properties of the fabricated gold nano-split-ring arrays with different parameters were measured. They show very obvious magnetic response to the incident light (which shows 10dB extinction ration in transmission spectra). The structure fabricated by this method can generate magnetic response in optical range with relatively large feature size that relax the requirement of resolution on lithography. 
Can Peng, Shufeng Bai and Stephen Y. Chou