Three-Band Plasmon-Induced Transparency with Epsilon-Near-Zero Material and Gold Nanoantenna

In this work, a PIT-like transparency is realized via the strong coupling of plasmonic dipole and epsilon-near-zero (ENZ) mode. Numerical simulations with the finite difference time-domain method (FDTD) demonstrate that triple transparent windows are achieved. The tunability of PIT resonant frequency and transmission amplitude can be achieved by changing the length or gap of the gold nanorods and the carrier concentration of ITO. Finally, it is found that the sensitivity of the model with the change of refractive index of background materials has reached 330.57 THz/RIU, and the figure of merit (FOM) has reached 27.54/RIU. This provides a theoretical reference for the application of the model in optical storage, filtering, and ultra-sensitive infrared band sensor design.

Automated summary

A PIT-like transparency is achieved by the strong coupling of plasmonic dipole and epsilon-near-zero (ENZ) mode, resulting in triple transparent windows. The tunability of the resonant frequency and transmission amplitude can be achieved by adjusting the length or gap of the gold nanorods and the carrier concentration of ITO. The model exhibits high sensitivity (330.57 THz/RIU) and a figure of merit (27.54/RIU), providing a theoretical reference for applications in optical storage, filtering, and ultra-sensitive infrared band sensor design.