Kakenov, N.Balci, O.Polat, E. O.Altan, H.Kocabas, C.2016-02-082016-02-0820150740-3224http://hdl.handle.net/11693/23547We demonstrate a terahertz intensity modulator using a graphene supercapacitor which consists of two large-area graphene electrodes and an electrolyte medium. The mutual electrolyte gating between the graphene electrodes provides very efficient electrostatic doping with Fermi energies of 1 eV and a charge density of 8 × 1013 cm-2. We show that the graphene supercapacitor yields more than 50% modulation between 0.1 and 1.4 THz with operation voltages less than 3 V. The low insertion losses, high modulation depth over a broad spectrum, and the simplicity of the device structure are the key attributes of graphene supercapacitors for THz applications.EnglishCapacitorsElectrodesElectrolytesGrapheneGraphite electrodesModulationModulatorsBroadband terahertzElectrostatic dopingGraphene electrodesIntensity modulatorsLarge-area grapheneLow insertion lossModulation depthOperation voltageElectrolytic capacitorsArticle10.1364/JOSAB.32.001861