Wednesday, February 4, 2015

Abstract-Graphene Terahertz Modulators by Ionic Liquid Gating

Cover image for Vol. 27 Issue 5

  1. Yang Wu1,2
  2. Chan La-o-vorakiat3,4,
  3. Xuepeng Qiu5
  4. Jingbo Liu6
  5. Praveen Deorani5
  6. Karan Banerjee5
  7. Jaesung Son5
  8. Yuanfu Chen6
  9. Elbert E. M. Chia4,*and
  10. Hyunsoo Yang1,2,*
Article first published online: 3 FEB 2015
DOI: 10.1002/adma.201405251

Excellent-performance terahertz (THz) modulators based on graphene/ionic liquid/graphene sandwich structures are demonstrated. The modulation covers a broadband frequency range from 0.1 to 2.5 THz with a modulation depth of up to 99% by applying a small gate voltage of 3 V. The outstanding performance of the proposed devices is due to the conical band structure of the graphene and the powerful gating effect of the ionic liquid in proximity to the graphene.

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