Extraordinary Optical Transmission Induced by Excitation of a Magnetic Plasmon Propagation Mode in a Diatomic Chain of Slit-hole Resonators

摘要

In this paper, we will propose that magnetic-resonance nanostructures in ametal surface could be used to realize extraordinary optical transmission(EOT). Toward this goal, we designed and fabricated a one dimensional diatomicchain of slit-hole resonator (SHR). Due to the strong exchange currentinteraction, a type of magnetic plasmon (MP) propagation mode with a broadfrequency bandwidth was established in this system. Apparent EOT peaks inducedby the MP mode were observed in our measured spectra at infrared frequencies.The strongest EOT peak was obtained at 1.07 eV with an incident angle of 20degree. The measured dependence of EOT peaks on the incident angle coincidedwith the theoretical results quite well. This proposed MP propagation mode inSHR structure has good potential applications in multifrequency nonlinearoptical processes.