Fig. 1. (a) Sketch of the designed nanorod trimer on x-y plane; (b) extinction spectrum of the nanorod trimer array

Fig. 2. Electric field distributions at the center of nanorod trimer in x-y plane. (a) Resonance peak at 745 nm; (b) resonance dip at 800 nm; (c) wavelength at 1050 nm

Fig. 3. (a) Sketch of the designed MIM nanorod oligomer in y-z plane; (b) extinction spectrum of the MIM nanorod oligomer array

Fig. 4. Electric field distributions of the MIM nanorod oligomer in x-y plane. (a) At the center of the bottom nanorod trimer; (b) at the center of the top nanorod

Fig. 5. (a) Effect of aspect ratio of nanorod on extinction spectra of the MIM nanorod oligomer array; (b) effect of insulator layer thickness on extinction spectra of the MIM nanorod oligomer array