Plasmon induced transparency in metal–insulator–metal waveguide by a stub coupled with F-P resonator

Abstract

A simple and compact metal–insulator–metal (MIM) stub coupled with Fabry–Perot (FP) resonator is proposed to realize the plasmonic analogue of electromagnetically induced transparency. By the coupling between the stub and the FP resonator, a narrow transmission peak is formed in the broad stop-band of the stub resonator. By combining the magnetic field distributions and the plasmon hybridization theory, the physical mechanism is presented, which is the mode splitting caused by the evanescent coupling between the plasmonic resonators. And the effects of the structure parameters on the transmission characteristics of the coupled system are analyzed in detail. Also, double plasmon induced transmission peaks can be realized by simply adding a second FP resonator into the system. The proposed compact and simple plasmonic structure may have potential applications in nanoscale filter and slow-light devices.