Paving the Way for Tunable Graphene Plasmonic THz Amplifiers (IMAGE)
Caption
Measured absorption/amplification spectra of the device response to the terahertz pulse wave radiation. The terahertz wave pulse was emitted while increasing the drain voltage of the prototype graphene transistor. Absorption characteristics (frequency spectrum) of the graphene transistor, in relation to the incident pulse wave, were obtained from the time response waveform of the transmitted pulse wave. When the drain voltage is above a certain threshold value, an amplification characteristic (a negative absorption) with the maximal gain of 0.09 (9%) was obtained.
Credit
Tohoku University
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Credit: Tohoku University
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