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Terahertz and ultrafast dynamics of carriers and phonons in graphene and carbon nanotubes
Author(s): Weilu Gao; Qi Zhang; Lei Ren; Zehua Jin; Ji-Hee Kim; Junichiro Kono
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Paper Abstract

Graphene and carbon nanotubes provide a variety of new opportunities for fundamental and applied research. Here, we describe results of our recent terahertz and ultrafast studies of carriers and phonons in these materials. Time-domain terahertz spectroscopy is a powerful method for determining the basic properties of charge carriers in a non-contact manner. We show how one can modulate the transmission of terahertz waves through graphene by gating and how one can improve the modulation performance by combining graphene with apertures and gratings. In carbon nanotubes, we demonstrate that the terahertz response is dominated by plasmon oscillations, which are enhanced by collective antenna effects when the nanotubes are aligned. Finally, ultrafast spectroscopy of carbon nanotubes allow us to excite and probe coherent phonons, both in the low-energy radial breathing mode and high-energy G-mode, which are strongly coupled with excitonic interband transitions.

Paper Details

Date Published: 7 March 2014
PDF: 11 pages
Proc. SPIE 8984, Ultrafast Phenomena and Nanophotonics XVIII, 89840K (7 March 2014); doi: 10.1117/12.2038295
Show Author Affiliations
Weilu Gao, Rice Univ. (United States)
Qi Zhang, Rice Univ. (United States)
Lei Ren, Rice Univ. (United States)
Zehua Jin, Rice Univ. (United States)
Ji-Hee Kim, Sungkyunkwan Univ. (Korea, Republic of)
Junichiro Kono, Rice Univ. (United States)

Published in SPIE Proceedings Vol. 8984:
Ultrafast Phenomena and Nanophotonics XVIII
Markus Betz; Abdulhakem Y. Elezzabi; Jin-Joo Song; Kong-Thon Tsen, Editor(s)

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