Unique prospects for graphene-based terahertz modulators

The modulation depth of two-dimensional electron-gas (2DEG) based terahertz (THz) modulators using AlGaAs/GaAs hetero-structures with metal gates is inherently limited to <30%. The metal gate not only attenuates the THz signal but also severely degrades modulation depth. Metal losses can be significantly reduced employing an alternative material with tunable conductivity. Graphene presents a unique solution to this problem due to its symmetric band structure and extraordinarily high hole mobility. In this work, we show that it is possible to achieve a modulation depth of >90% while simultaneously minimizing signal attenuation to <5% by tuning the Fermi level at its Dirac point. VC 2011 American Institute of Physics. [doi:10.1063/1.3636435]

• Publication year

  2011

• Venue

  Applied Physics Letters

• Publication date

  2011-07-24

• Fields of study

  Physics, Engineering

• Identifiers
  DOI 10.1063/1.3636435arXiv 1107.4725
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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