Λ-Type and V-Type Plasmon-Induced Transparency in Plasmonic Waveguide Systems

we present bright-dark-bright mode, dark-bright-bright mode, and bright-dark-bright-dark mode plasmonic waveguide structures. and the typical plasmon-induced transparency (pit) spectra are observed in our proposed structure. in addition, we firstly make an attempt to introduce v-type pit and λ-type pit to describe transmission spectra in bright-dark-bright mode, dark-bright-bright mode plasmonic waveguide systems, respectively. interestingly, we can see the v-type pit and λ-type pit in bright-dark-bright-dark mode plasmonic waveguide structures. the proposed model and findings may provide guidance for fundamental research of the plasmonic devices applications.