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

TL;DR

This study demonstrates that magnetic-resonance nanostructures can induce extraordinary optical transmission through a diatomic chain of slit-hole resonators, revealing a magnetic plasmon mode with broad bandwidth and potential for nonlinear optics.

Contribution

The paper introduces a novel magnetic plasmon propagation mode in a diatomic chain of slit-hole resonators, enabling extraordinary optical transmission at infrared frequencies.

Findings

EOT peaks observed at infrared frequencies

Strong agreement between experimental and theoretical EOT dependence on incident angle

Potential applications in multifrequency nonlinear optical processes

Abstract

In this paper, we will propose that magnetic-resonance nanostructures in a metal surface could be used to realize extraordinary optical transmission (EOT). Toward this goal, we designed and fabricated a one dimensional diatomic chain of slit-hole resonator (SHR). Due to the strong exchange current interaction, a type of magnetic plasmon (MP) propagation mode with a broad frequency bandwidth was established in this system. Apparent EOT peaks induced by 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 20 degree. The measured dependence of EOT peaks on the incident angle coincided with the theoretical results quite well. This proposed MP propagation mode in SHR structure has good potential applications in multifrequency nonlinear optical processes.