Broadband terahertz modulators using self-gated graphene capacitors

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...

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Veröffentlicht in:	Journal of the Optical Society of America. B, Optical physics Optical physics, 2015-09, Vol.32 (9), p.1861-1866
Hauptverfasser:	Kakenov, Nurbek, Balci, Osman, Polat, Emre O., Altan, Hakan, Kocabas, Coskun
Format:	Artikel
Sprache:	eng
Schlagworte:	Capacitors Electrodes Electrolytes Fermi surfaces Graphene Modulation Modulators Supercapacitors
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container_title	Journal of the Optical Society of America. B, Optical physics
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creator	Kakenov, Nurbek Balci, Osman Polat, Emre O. Altan, Hakan Kocabas, Coskun
description	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 super(13) cm super(-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.
doi_str_mv	10.1364/JOSAB.32.001861
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subjects	Capacitors Electrodes Electrolytes Fermi surfaces Graphene Modulation Modulators Supercapacitors
title	Broadband terahertz modulators using self-gated graphene capacitors
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