Mapping the complex refractive index of single layer graphene on semiconductor or polymeric substrates at terahertz frequencies
Authors
Pistore, V
Schinde, SM
Meersha, Adil
Publication Date
2022-04-01Journal Title
2D Materials
ISSN
2053-1583
Publisher
IOP Publishing
Volume
9
Issue
2
Language
en
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Pistore, V., Balci, O., Zhang, J., Schinde, S., Meersha, A., Ferrari, A., & Vitiello, M. (2022). Mapping the complex refractive index of single layer graphene on semiconductor or polymeric substrates at terahertz frequencies. 2D Materials, 9 (2) https://doi.org/10.1088/2053-1583/ac57c9
Abstract
<jats:title>Abstract</jats:title>
<jats:p>Assessing experimentally the main optical parameters of graphene (e.g. complex refractive index, carrier density, mobility) in the far-infrared (0.1–10 THz) is important for quantum science, due to the possibility to devise miniaturized devices (frequency combs, random lasers), components (optical switches, spatial light modulators, metamaterial mirrors and modulators) or photonic circuits, in which graphene can be integrated with existing semiconductor technologies to manipulate their optical properties and induce novel functionalities. Here, we combine time domain terahertz (THz) spectroscopy and Fourier transform infrared spectroscopy to extract the complex refractive index of large (∼1cm<jats:sup>2</jats:sup>) area single layer graphene on thin (∼0.1-1 <jats:italic>µ</jats:italic>m) polymeric suspended substrates, flexible and transparent films, and high reflectivity Si substrates in the 0.4–1.8 THz range. We model our data to extract the relevant optical (refractive index, absorption coefficient, penetration length) electronic (Fermi velocity) and electrical (carrier density, mobility) properties of the different graphene samples.</jats:p>
Keywords
Paper, refractive index, graphene, optical properties, terahertz
Sponsorship
Engineering and Physical Sciences Research Council (EP/L016087/1)
Engineering and Physical Sciences Research Council (EP/K01711X/1)
Engineering and Physical Sciences Research Council (EP/K017144/1)
Identifiers
tdmac57c9, ac57c9, 2dm-107381.r1
External DOI: https://doi.org/10.1088/2053-1583/ac57c9
This record's URL: https://www.repository.cam.ac.uk/handle/1810/335117
Rights
Licence:
http://creativecommons.org/licenses/by/4.0
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