Abstract-Broadband terahertz modulators using self-gated graphene capacitors

Nurbek Kakenov, Osman Balci, Emre O. Polat, Hakan Altan, and Coskun Kocabas
https://www.osapublishing.org/josab/abstract.cfm?uri=josab-32-9-1861

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 8×1013  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.

© 2015 Optical Society of America

Full Article  |  PDF Article