Anisotropic high-field terahertz response of free-standing carbon nanotubes

We demonstrate that unidirectionally aligned, free-standing multi-walled carbon nanotubes (CNTs) exhibit highly anisotropic linear and nonlinear terahertz (THz) responses. For the polarization parallel to the CNT axis, strong THz pulses induce nonlinear absorption in the quasi-one-dimensional conduc...

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Veröffentlicht in:Applied physics letters 2016-06, Vol.108 (24)
Hauptverfasser: Lee, Byounghwak, Mousavian, Ali, Paul, Michael J., Thompson, Zachary J., Stickel, Andrew D., McCuen, Dalton R., Jang, Eui Yun, Kim, Yong Hyup, Kyoung, Jisoo, Kim, Dai-Sik, Lee, Yun-Shik
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Sprache:eng
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Zusammenfassung:We demonstrate that unidirectionally aligned, free-standing multi-walled carbon nanotubes (CNTs) exhibit highly anisotropic linear and nonlinear terahertz (THz) responses. For the polarization parallel to the CNT axis, strong THz pulses induce nonlinear absorption in the quasi-one-dimensional conducting media, while no nonlinear effect is observed in the perpendicular polarization configuration. Time-resolved measurements of transmitted THz pulses and a theoretical analysis of the data reveal that intense THz fields enhance permittivity in carbon nanotubes by generating charge carriers.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4954222