High-Contrast Imaging of Graphene via Time-Domain Terahertz Spectroscopy

  • J. L. Tomaino
  • A. D. Jameson
  • M. J. Paul
  • J. W. Kevek
  • A. M. van der Zande
  • R. A. Barton
  • H. Choi
  • P. L. McEuen
  • E. D. Minot
  • Yun-Shik Lee
Article

Abstract

We demonstrate terahertz (THz) imaging and spectroscopy of single-layer graphene deposited on an intrinsic Si substrate using THz time-domain spectroscopy. A single-cycle THz pulse undergoes multiple internal reflections within the Si substrate, and the THz absorption by the graphene layer accumulates through the multiple interactions with the graphene/Si interface. We exploit the large absorption of the multiply reflected THz pulses to acquire high-contrast THz images of graphene. We obtain local sheet conductivity of the graphene layer analyzing the transmission data with thin-film Fresnel formula based on the Drude model.

Keywords

Graphene Terahertz imaging Time-domain spectroscopy Multiple internal reflections 

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • J. L. Tomaino
    • 1
  • A. D. Jameson
    • 1
  • M. J. Paul
    • 1
  • J. W. Kevek
    • 2
  • A. M. van der Zande
    • 2
  • R. A. Barton
    • 3
  • H. Choi
    • 4
  • P. L. McEuen
    • 2
    • 5
  • E. D. Minot
    • 1
  • Yun-Shik Lee
    • 1
  1. 1.Department of PhysicsOregon State UniversityCorvallisUSA
  2. 2.Laboratory of Atomic and Solid-State PhysicsCornell UniversityIthacaUSA
  3. 3.School of Applied and Engineering PhysicsCornell UniversityIthacaUSA
  4. 4.School of Electrical and Electronic EngineeringYonsei UniversitySeoulRepublic of Korea
  5. 5.Kavli Institute at Cornell for Nanoscale ScienceCornell UniversityIthacaUSA

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