Broadband terahertz modulators using self-gated graphene capacitors


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Kakenov N., Balci O., Polat E. O. , ALTAN H. , KOCABAŞ C.

JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, cilt.32, ss.1861-1866, 2015 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 32 Konu: 9
  • Basım Tarihi: 2015
  • Doi Numarası: 10.1364/josab.32.001861
  • Dergi Adı: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
  • Sayfa Sayıları: ss.1861-1866

Özet

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