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Terahertz induced transparency in single-layer graphene

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https://ir.library.oregonstate.edu/concern/articles/sf268682t

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Abstract
  • We show that the transmission of a terahertz (THz) pulse through single-layer graphene is strongly nonlinear. As the peak electric field of the THz pulse exceeds 50 kV/cm, the graphene becomes increasingly transparent to the THz radiation. When field strength reaches 800 kV/cm, the increased transparency corresponds to a two-fold decrease in the time-average sheet conductivity of the graphene (time averaged over the duration of the pulse). Time-resolved measurements reveal that the leading portion of the pulse creates transparency for the trailing portion, with a 10-fold suppression in sheet conductivity at the tail of the strongest THz pulse. Comparing the THz-induced transparency phenomena in different sample geometries shows that substrate-free graphene is the best geometry for maximizing the nonlinear transparency effect.
  • Keywords: Transistors, Spectroscopy
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  • Paul, M. J., Lee, B., Wardini, J. L., Thompson, Z. J., Stickel, A. D., Mousavian, A., ... & Lee, Y. S. (2014). Terahertz Induced Transparency in Single-Layer Graphene. Applied Physics Letters, 105(22), 221107. doi:10.1063/1.4902999
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  • 105
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  • 22
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  • This work was supported by the National Science Foundation (No. DMR-1063632) and National Research Foundation of Korea Grant (No. NRF-2011-220-D00052). The work at Yonsei was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (Nos. NRF-2011-220-D00052 and 2011-0013255).
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