Appl. Phys. Lett. 108, 241111 (2016); http://dx.doi.org/10.1063/1.4954222
http://scitation.aip.org/content/aip/journal/apl/108/24/10.1063/1.4954222
http://scitation.aip.org/content/aip/journal/apl/108/24/10.1063/1.4954222
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 CNTaxis, 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.
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