Resonant plasmonic effects in periodic graphene antidot arrays

TL;DR

This paper demonstrates that periodic graphene antidot arrays exhibit strong surface plasmon resonances in microwave and terahertz frequencies, leading to enhanced absorption and suppressed transmission.

Contribution

It introduces the concept of resonant plasmonic effects in perforated graphene sheets, showing how antidot arrays can significantly enhance absorption compared to continuous graphene.

Findings

Resonances occur in microwave and terahertz regions.

Absorption can exceed that of continuous graphene.

Higher charge carrier relaxation times improve efficiency.

Abstract

We show that a graphene sheet perforated with micro- or nano-size antidots have prominent absorption resonances in the microwave and terahertz regions. These resonances correspond to surface plasmons of a continuous sheet "perturbed" by a lattice. They are excited in different diffraction orders, in contrast to cavity surface plasmon modes existing in disconnected graphene structures. The resonant absorption by the antidot array can essentially exceed the absorption by a continuous graphene sheet, even for high antidot diameter-to-period aspect ratios. Surface plasmon-enhanced absorption and suppressed transmission is more efficient for higher relaxation times of the charge carriers.