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We report on terahertz amplitude modulators using electrolyte-gated graphene single layers placed at a quarter wavelength distance from a reflecting Au film (Salisbury mirror scheme). By exploiting the electric field concentration at the graphene/electrolyte interface, a modulation as high as 45% is achieved in a wide spectral range (1.5-6 THz) with applied voltages in the range [-0.6 V, +0.6 V], which is remarkable considering the small voltages and the atomically thin active region. Graphene-based THz modulators’ main advantages are: facile fabrication, low cost and excellent tunability, thus promising for THz system applications.
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