Achieving 100% amplitude modulation depth in the terahertz range with graphene-based tuneable capacitance metamaterials.

ABSTRACT: Effective control of terahertz radiation requires fast and efficient modulators with a large modulation depth-a challenge that is often tackled by using metamaterials. Metamaterial-based active modulators can be created by placing graphene as a tuneable element shunting regions of high electric field confinement in metamaterials. However, in this common approach, the graphene is used as a variable resistor, and the modulation is achieved by resistive damping of the resonance. In combination with the finite conductivity of graphene due to its gapless nature, achieving 100% modulation depth using this approach remains challenging. Here, we embed nanoscale graphene capacitors within the gaps of the metamaterial resonators, and thus switch from a resistive damping to a capacitive tuning of the

SUBMITTER: Xia R 

PROVIDER: S-EPMC12319094 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature