Tunable plasmon induced transparency in the ellipse-shaped resonators coupled waveguide

Abstract

We study spectral responses in a bright-dark mode ellipse-shaped resonators coupled waveguide. The results show that the plasmon-induced transparency (PIT) can be observed in the ellipse-shaped resonators coupled waveguide, and the symmetric line shape at the PIT window can be tuned by the radii of the long axis in ellipse-shaped resonators, the coupling distance, and the symmetry broken degree. Interestingly, the radii of the long axis for the bright mode and dark mode have opposite effect on the spectra of PIT. Our research results may pave the way for the understanding and tuning of PIT.

Keywords

• Plasmon-induced transparency
• Metal-dielectric-metal waveguide
• Surface plasmon