Enhancing the electric fields around the nanorods by using metal grooves
To enhance electric fields around nanorods, a Ag nanorod-groove system is presented and its electric field distribution is studied using the finite difference time domain method. Since the superposition of the electric fields of the split multi-beam of light works as excitation for electron oscillations in the nanorods, enhanced electric fields occur around the nanorods. In addition, the effects of topological parameters of the nanorod-groove system, such as the oblique angle of the groove, displacement of the nanorod to the bottom of the groove, and separation between the nanorods on electric field distributions are also studied. These results may be helpful for designing substrates to obtain larger electric fields around nanorods.