Electromagnetically Induced Transparency-Like Effect by Dark-Dark Mode Coupling

Abstract

Electromagnetically induced transparency-like (EIT-like) effect is a promising research area for applications of slow light, sensing and metamaterials. The EIT-like effect is generally formed by the destructive interference of bright-dark mode coupling and bright-bright mode coupling. There are seldom reports about EIT-like effect realized by the coupling of two dark modes. In this paper, we numerically and theoretically demonstrated that the EIT-like effect is achieved through dark-dark mode coupling of two waveguide resonances in a compound nanosystem with metal grating and multilayer structure. If we introduce |1〉, | 2 〉 and | 3 〉 to represent the surface plasmon polaritons (SPPs) resonance, waveguide resonance in layer 2, and waveguide resonance in layer 4, the destructive interference occurs between two pathways of | 0 〉 → | 1 〉 → | 2 〉 and | 0 〉 → | 1 〉 → | 2 〉 → | 3 〉 → | 2 〉 , where | 0 〉 is the ground state without excitation. Our work will stimulate more studies on EIT-like effect with dark-dark mode coupling in other systems.

Active Electromagnetically Induced Transparency Effect in Graphene-Dielectric Hybrid Metamaterial and Its High-Performance Sensor Application

“…Stringent experiment conditions like ultracold temperatures and stable coherent lights are not necessary in the resonant systems, which makes them perfect platforms to research the EIT-like effect. Functional manipulations of electromagnetic waves can be easily realized with unique performance like strong dispersion and a large group delay, which has great potential for applications in slow light devices [ 5 , 6 ], nonlinear optics [ 7 ], optical sensing [ 8 , 9 ], and optical storage [ 10 , 11 ]. However, metallic metamaterials usually find it difficult to achieve high transmission, Q-factor, and group index in Terahertz and near-infrared regions due to the ohmic loss of metals as well as the radiative loss of surface modes [ 12 ].…”