Broadband terahertz modulators using self-gated graphene capacitors

Kakenov, Nurbek
Balci, Osman
Polat, Emre O.
Altan, Hakan
We 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 x 10(13) 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. (C) 2015 Optical Society of America

Citation Formats
N. Kakenov, O. Balci, E. O. Polat, H. Altan, and C. KOCABAŞ, “Broadband terahertz modulators using self-gated graphene capacitors,” JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, vol. 32, no. 9, pp. 1861–1866, 2015, Accessed: 00, 2020. [Online]. Available: