This work describes the broadband optical response of graphene grown by chemical vapor deposition by combining terahertz time-domain spectroscopy (THz-TDS) at 0.25–1.7 THz (8–60 cm−1) with Fourier Transform Infrared Spectroscopy (FTIR) at 11–210 THz (370–7000 cm−1). It is shown that the measured response is well described by a combination of the Drude model, expressing free-carrier absorption/reflection, and an expression for interband absorption. The THz-TDS and FTIR transmittance curves are fitted consistently using this model. This indicates that these techniques are complementary to each other. Both can thus be employed together or individually to characterize the electronic properties of graphene (e.g., carrier density and mobility). To exemplify this, we demonstrate that this equivalency can be used to study the effect of substrate-dependent doping on the optical response of graphene. Furthermore, the amount of reflection and absorption corresponding to the measured transmittance curve is calculated. The toolbox for the non-invasive broadband characterization of graphene is thus extended by this work.
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21 August 2018
Research Article|
August 21 2018
Broadband optical response of graphene measured by terahertz time-domain spectroscopy and FTIR spectroscopy
Karsten Arts
;
Karsten Arts
1
Department of Applied Physics, Eindhoven University of Technology
, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
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René Vervuurt;
René Vervuurt
1
Department of Applied Physics, Eindhoven University of Technology
, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
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Arkabrata Bhattacharya
;
Arkabrata Bhattacharya
a)
2
Dutch Institute for Fundamental Energy Research (DIFFER)
, P.O. Box 6336, 5600 HH Eindhoven, The Netherlands
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Jaime Gómez Rivas;
Jaime Gómez Rivas
1
Department of Applied Physics, Eindhoven University of Technology
, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
2
Dutch Institute for Fundamental Energy Research (DIFFER)
, P.O. Box 6336, 5600 HH Eindhoven, The Netherlands
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Johan Willem Oosterbeek;
Johan Willem Oosterbeek
3
Euratom Association
, Max-Planck-Institut für Plasmaphysik, Wendelsteinstr. 1, 17491 Greifswald, Germany
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Ageeth A. Bol
Ageeth A. Bol
1
Department of Applied Physics, Eindhoven University of Technology
, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
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a)
Present address: Tata Institute of Fundamental Research, Mumbai 400005, India.
J. Appl. Phys. 124, 073105 (2018)
Article history
Received:
June 12 2018
Accepted:
August 02 2018
Citation
Karsten Arts, René Vervuurt, Arkabrata Bhattacharya, Jaime Gómez Rivas, Johan Willem Oosterbeek, Ageeth A. Bol; Broadband optical response of graphene measured by terahertz time-domain spectroscopy and FTIR spectroscopy. J. Appl. Phys. 21 August 2018; 124 (7): 073105. https://doi.org/10.1063/1.5044265
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