In this work, we demonstrate strong electric resonance response in perforated graphene sheet at far-infrared part of electromagnetic spectrum. Unlike the metallic meta-materials relying on the geometrical inductance for magnetic response, the electric resonance in graphene is mainly caused by localized plasmons and thus enabling sub-wavelength confinement of electromagnetic field. The active tunable electric resonance by electrostatic doping on the graphene sheet provides efficient route for compact biosening, far-infrared imaging and detection.

© 2015 Optical Society of America

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