Friday, April 17, 2015

Abstract-Generation of terahertz radiation by optical excitation of aligned carbon nanotubes

Nano Lett., Just Accepted Manuscript
DOI: 10.1021/acs.nanolett.5b00494
Publication Date (Web): April 16, 2015
Copyright © 2015 American Chemical Society

We have generated coherent pulses of terahertz radiation from macroscopic arrays of aligned single-wall carbon nanotubes (SWCNTs) excited by femtosecond optical pulses without externally applied bias. The generated terahertz radiation is polarized along the SWCNT alignment direction. We propose that top-bottom asymmetry in the SWCNT arrays produces a built-in electric field in semiconducting SWCNTs, which enables generation of polarized terahertz radiation by a transient photocurrent surge directed along the nanotube axis.

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