CUED Publications database

Broadband terahertz modulators using self-gated graphene capacitors

Kakenov, N and Balci, O and Polat, EO and Altan, H and Kocabas, C (2015) Broadband terahertz modulators using self-gated graphene capacitors. Journal of the Optical Society of America B: Optical Physics, 32. pp. 1861-1866. ISSN 0740-3224

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© 2015 Optical Society of America. 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.

Item Type: Article
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 22 Mar 2018 01:27
Last Modified: 24 Nov 2020 08:36
DOI: 10.1364/JOSAB.32.001861