Gate Tunable Coupling of Epsilon-Near-Zero and Plasmonic Modes

In this work, an active tuning of the coupling strength in a strongly coupled system comprised of a thin epsilon-near-zero material and gold nanorods as plasmonic resonators is demonstrated. A novel gating scheme is developed where an ionic liquid is employed to bias the coupled system and tune the coupling in transmission mode. A significant tuning of the coupled resonance up to 30 nm is observed by changing the bias voltages from 0 to 4.5 V. This control mechanism on strong coupling opens exciting opportunities for various disruptive applications by offering advanced control and tunability on strongly coupled systems.

Automated summary

This work demonstrates the active tuning of coupling strength in a strongly coupled system comprised of a thin epsilon-near-zero material and gold nanorods. A novel gating scheme using an ionic liquid is developed to bias the system and tune the coupling in transmission mode, resulting in a significant tuning of the coupled resonance up to 30 nm by changing bias voltages from 0 to 4.5 V. This control mechanism on strong coupling offers exciting opportunities for various disruptive applications by providing advanced control and tunability.