Graphene-based tunable terahertz plasmon-induced transparency metamaterial

Area of Science:

• Terahertz (THz) metamaterials
• Plasmonics
• Graphene-based devices

Background:

• Plasmon induced transparency (PIT) is a phenomenon observed in metamaterials, enabling sharp resonant transmission peaks.
• Graphene, a single layer of carbon atoms, offers unique electromagnetic properties tunable via its Fermi level.

Purpose of the Study:

• To propose and numerically investigate a novel single-layered graphene metamaterial structure exhibiting plasmon induced transparency (PIT).
• To demonstrate dynamic tunability of the PIT effect by controlling graphene's Fermi level.
• To explore potential applications in tunable terahertz devices and slow light technologies.

Main Methods:

• Numerical simulation of a metamaterial structure composed of single-layered graphene microstructures.
• Analysis of transmission spectra to identify and characterize the plasmon induced transparency (PIT) peak.
• Investigation of the effect of Fermi level tuning on the spectral characteristics of the PIT peak.

Main Results:

• A pronounced transparency peak was achieved in the transmission spectrum due to destructive interference between graphene dipole and monopole antennas.
• The spectral position and lineshape of the transparency peak were found to be dynamically tunable by adjusting the Fermi level of graphene.
• The continuous form of monopole antennas facilitated easier tunability via gate voltage compared to discrete graphene patterns.

Conclusions:

• The proposed graphene metamaterial effectively demonstrates tunable plasmon induced transparency (PIT).
• The dynamic control over the transparency peak opens possibilities for advanced terahertz functional devices.
• This research contributes to the development of novel slow light applications and tunable THz devices.