Tunable multiple plasmon resonances and local field enhancement of nanocrescent/nanoring structure

Wang Bin-Bing^a), Zhou Jun†^a), Chen Dong^a), Fang Yun-Tuan^b), Chen Ming-Yang^c)

Optical extinction spectra of the NCNR structure at R _out = 60 nm and various values of wall thickness t for the values of gap width g of (a) 2 nm, (b) 4 nm, (c) 6 nm, and (d) 10 nm. The solid lines named “NCND” are corresponding to the extinction spectra of the nanocrescent/nanodisk structure.