Journal
NANO LETTERS
Volume 15, Issue 5, Pages 3267-3272Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b00494
Keywords
Single-wall carbon nanotubes; SWCNTs; terahertz generation; THz pulses
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canada Foundation for Innovation (CFI)
- Alberta Science and Research Investment Program (ASRIP)
- Alberta Innovates Technology Futures (AITF)
- iCORE Centre for Interdisciplinary Nanoscience (iCiNano)
- DOE BES [DE-FG02-06ER46308]
- Robert A. Welch Foundation [C-1509]
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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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