Generation of Terahertz Radiation by Optical Excitation of Aligned Carbon Nanotubes
Abstract
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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THz emission studies have indicated that variation in spatial ordering across different regions of a carbon nanotube array can break symmetry, leading to nonzero drift currents.
“However, THz emission studies have indicated that variation in spatial ordering across different regions of an array can break this symmetry, leading to nonzero drift currents227.”
From Ultrafast terahertz emission from emerging symmetry-broken materials (2023) · cites this paper as [227]
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- Authors
- Titova, L. V., Pint, C. L., Zhang, Q., Hauge, R. H., Kono, J., & Hegmann, F. A.
- Affiliations
- Worcester Polytechnic Institute (US)
- Vanderbilt University (US)
- University of Alberta (CA)
- Venue
- Nano Letters
- Publisher
- American Chemical Society (ACS)
- Published
- 2015-04-20
- Volume
- 15
- Issue
- 5
- Pages
- 3267-3272
- ISSN
- 1530-6984 (ISSN-L)
- 1530-6992
- OpenAlex
- W2334689112
- Cited by
- 102
- References
- 44
- Citations by year
- 2026: 2 · 2025: 5 · 2024: 8 · 2023: 8 · 2022: 16 · 2021: 7 · 2020: 8 · 2019: 13 · 2018: 10 · 2017: 10 · 2016: 14 · 2015: 1
- FWCI
- 5.63
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Nano Letters (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Welch Foundation (C-1509)
- Basic Energy Sciences (DE-FG02-06ER46308)
- Natural Sciences and Engineering Research Council of Canada
- Alberta Innovates - Technology Futures
- Canada Foundation for Innovation
- Centre for Interdisciplinary Nanoscience
- Topics
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Terahertz technology and applications
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Laser-Matter Interactions and Applications
- Physical Sciences › Materials Science › Materials Chemistry › Graphene research and applications
- Keywords
- terahertz generation, single-walled carbon nanotubes, aligned carbon nanotube arrays, femtosecond optical excitation, built-in electric field, transient photocurrent
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