Patrick R. Whelan, Krzysztof Iwaszczuk, Ruizhi Wang, Stephan Hofmann, Peter Bøggild, and Peter Uhd Jepsen
obust mapping of electrical properties of graphene from terahertz time-domain spectroscopy with timing jitter correction
We demonstrate a method for reliably determining the electrical properties of graphene including the carrier scattering time and carrier drift mobility from terahertz time- domain spectroscopy measurements (THz-TDS). By comparing transients originating from directly transmitted pulses and the echoes from internal reflections in a substrate, we are able to extract electrical properties irrespective of random time delays between pulses emitted in a THz-TDS setup. If such time delays are not accounted for they can significantly influence the extracted properties of the material. The technique is useful for a robust determination of electrical properties from THz-TDS measurements and is compatible with substrate materials where transients from internal reflections are well-separated in time.
© 2017 Optical Society of America
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