Researchers at the UK’s University of Cambridge, Queen Mary University of London, University College London and Germany’s University of Augsburg have demonstrated 100% amplitude modulation depth in the terahertz frequency regime using a novel graphene-based tunable capacitance metamaterial.
The team explained that 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 tunable 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 remained challenging.
Researchers at the UK’s University of Cambridge, Queen Mary University of London, University College London and Germany’s University of Augsburg have demonstrated 100% amplitude modulation depth in the terahertz frequency regime using a novel graphene-based tunable capacitance metamaterial. The team explained that 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 tunable 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 remained challenging.
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