Tunable multiple plasmon resonances and local field enhancement of nanocrescent/nanoring structure
Wang Bin-Binga), Zhou Jun†a), Chen Donga), Fang Yun-Tuanb), Chen Ming-Yangc)
       
(a) Array of three-dimensional NCNR structures on a substrate. (b) Schematic diagram of the NCNR geometry. E and K are the electric field vector and the wave vector of the incident light, respectively.