期刊
SENSORS
卷 23, 期 7, 页码 -出版社
MDPI
DOI: 10.3390/s23073669
关键词
graphene; AC conductivity; THz time-domain spectroscopy; reflection spectroscopy
We accurately determine the conductivity of graphene on thin-film polymer substrates using reflection-mode air-plasma-based THz time-domain spectroscopy (THz-TDS). The phase uncertainty issue associated with reflection measurements is discussed and our implementation is validated through convincing agreement with graphene electrical properties extracted from more conventional transmission-mode measurements. Both reflection and transmission THz-TDS measurements reveal a strong non-linear and instantaneous conductivity depletion across an ultra-broad bandwidth (1-9 THz) under relatively high incident THz electrical field strengths (up to 1050 kV/cm).
We demonstrate that the conductivity of graphene on thin-film polymer substrates can be accurately determined by reflection-mode air-plasma-based THz time-domain spectroscopy (THz-TDS). The phase uncertainty issue associated with reflection measurements is discussed, and our implementation is validated by convincing agreement with graphene electrical properties extracted from more conventional transmission-mode measurements. Both the reflection and transmission THz-TDS measurements reveal strong non-linear and instantaneous conductivity depletion across an ultra-broad bandwidth (1-9 THz) under relatively high incident THz electrical field strengths (up to 1050 kV/cm).
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