Ultra-fast all-optical plasmon induced transparency in a metal-insulator-metal waveguide containing two Kerr nonlinear ring resonators

In this work, an ultra-fast all-optical plasmon induced transparency based on a metal-insulator-metal nanoplasmonic waveguide with two Kerr nonlinear ring resonators is studied. Two-dimensional simulations utilizing the finite-difference time-domain method are used to show an obvious optical bistability and significant switching mechanisms of the signal light by varying the pump-light intensity. The proposed all-optical switching based on plasmon induced transparency demonstrates femtosecond-scale feedback time (90 fs), meaning ultra-fast switching can be achieved. The presented all-optical switch may have potential significant applications in integrated optical circuits.