Dynamically tunable Fano resonance in periodically asymmetric graphene nanodisk pair

TL;DR

This paper demonstrates a graphene-based device that exhibits tunable Fano resonance in the mid-infrared range, with potential applications in THz filtering and modulation.

Contribution

It introduces a dynamically tunable Fano resonance device using periodically asymmetric graphene nanodisks, controllable via Fermi energy adjustments.

Findings

Fano resonance can be dynamically tuned by changing graphene's Fermi energy.

The device exhibits both symmetric and antisymmetric modes leading to Fano resonance.

Potential for applications in tunable THz devices.

Abstract

We present a dynamically frequency tunable Fano resonance planar device composed of periodically asymmetric graphene nanodisk pair for the mid-infrared region. There are two kinds of modes in this structure, that is, the symmetric mode and the antisymmetric mode. The resonance coupling between the symmetric and antisymmetric modes creates a classical Fano resonance. Both of the Fano resonance amplitude and frequency of the structure can be dynamically controlled by varying the Fermi energy of graphene. Resonance transition in the structure is studied to reveal the physical mechanism behind the dynamically tunable Fano resonance. The features of the Fano resonant graphene nanostructures should have promising applications in tunable THz filters, switches, and modulators.