Broadband terahertz modulators using self-gated graphene capacitors

Kakenov, N., Balci, O., Polat, E. O., 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(9), pp. 1861-1866. (doi: 10.1364/JOSAB.32.001861)

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Abstract

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:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Polat, Dr Emre Ozan
Authors: Kakenov, N., Balci, O., Polat, E. O., Altan, H., and Kocabas, C.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Journal of the Optical Society of America B: Optical Physics
Publisher:Optical Society of America
ISSN:0740-3224
ISSN (Online):1520-8540

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