Aligned copper nanorod arrays for highly efficient generation of intense ultra-broadband THz pulses

S. Mondal, Q. Wei, W. J. Ding, H. A. Hafez, M. A. Fareed, A. Laramée, X. Ropagnol, G. Zhang, S. Sun, Z. M. Sheng, J. Zhang, T. Ozaki

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Abstract

We demonstrate an intense broadband terahertz (THz) source based on the interaction of relativistic-intensity femtosecond lasers with aligned copper nanorod array targets. For copper nanorod targets with a length of 5 μm, a maximum 13.8 times enhancement in the THz pulse energy (in ≤20 THz spectral range) is measured as compared to that with a thick plane copper target under the same laser conditions. A further increase in the nanorod length leads to a decrease in the THz pulse energy at medium frequencies (≤20 THz) and increase of the electromagnetic pulse energy in the high-frequency range (from 20–200 THz). For the latter, we measure a maximum energy enhancement of 28 times for the nanorod targets with a length of 60 μm. Particle-in-cell simulations reveal that THz pulses are mostly generated by coherent transition radiation of laser produced hot electrons, which are efficiently enhanced with the use of nanorod targets. Good agreement is found between the simulation and experimental results.
Original languageEnglish
Article number40058
Number of pages9
JournalScientific Reports
Volume7
DOIs
Publication statusPublished - 10 Jan 2017

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nanorods
broadband
copper
pulses
lasers
electromagnetic pulses
energy
augmentation
hot electrons
simulation
frequency ranges
radiation
cells
interactions

Keywords

  • broadband terahertz
  • copper nanorod arrays
  • intense ultra-broadband THz pulses
  • femotosecond lasers
  • terahertz radaiation
  • imaging
  • laser-plasma interaction

Cite this

Mondal, S., Wei, Q., Ding, W. J., Hafez, H. A., Fareed, M. A., Laramée, A., ... Ozaki, T. (2017). Aligned copper nanorod arrays for highly efficient generation of intense ultra-broadband THz pulses. Scientific Reports, 7, [40058]. https://doi.org/10.1038/srep40058
Mondal, S. ; Wei, Q. ; Ding, W. J. ; Hafez, H. A. ; Fareed, M. A. ; Laramée, A. ; Ropagnol, X. ; Zhang, G. ; Sun, S. ; Sheng, Z. M. ; Zhang, J. ; Ozaki, T. / Aligned copper nanorod arrays for highly efficient generation of intense ultra-broadband THz pulses. In: Scientific Reports. 2017 ; Vol. 7.
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abstract = "We demonstrate an intense broadband terahertz (THz) source based on the interaction of relativistic-intensity femtosecond lasers with aligned copper nanorod array targets. For copper nanorod targets with a length of 5 μm, a maximum 13.8 times enhancement in the THz pulse energy (in ≤20 THz spectral range) is measured as compared to that with a thick plane copper target under the same laser conditions. A further increase in the nanorod length leads to a decrease in the THz pulse energy at medium frequencies (≤20 THz) and increase of the electromagnetic pulse energy in the high-frequency range (from 20–200 THz). For the latter, we measure a maximum energy enhancement of 28 times for the nanorod targets with a length of 60 μm. Particle-in-cell simulations reveal that THz pulses are mostly generated by coherent transition radiation of laser produced hot electrons, which are efficiently enhanced with the use of nanorod targets. Good agreement is found between the simulation and experimental results.",
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author = "S. Mondal and Q. Wei and Ding, {W. J.} and Hafez, {H. A.} and Fareed, {M. A.} and A. Laram{\'e}e and X. Ropagnol and G. Zhang and S. Sun and Sheng, {Z. M.} and J. Zhang and T. Ozaki",
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Mondal, S, Wei, Q, Ding, WJ, Hafez, HA, Fareed, MA, Laramée, A, Ropagnol, X, Zhang, G, Sun, S, Sheng, ZM, Zhang, J & Ozaki, T 2017, 'Aligned copper nanorod arrays for highly efficient generation of intense ultra-broadband THz pulses', Scientific Reports, vol. 7, 40058. https://doi.org/10.1038/srep40058

Aligned copper nanorod arrays for highly efficient generation of intense ultra-broadband THz pulses. / Mondal, S.; Wei, Q.; Ding, W. J.; Hafez, H. A. ; Fareed, M. A. ; Laramée, A. ; Ropagnol, X.; Zhang, G.; Sun, S.; Sheng, Z. M.; Zhang, J.; Ozaki, T.

In: Scientific Reports, Vol. 7, 40058, 10.01.2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Aligned copper nanorod arrays for highly efficient generation of intense ultra-broadband THz pulses

AU - Mondal, S.

AU - Wei, Q.

AU - Ding, W. J.

AU - Hafez, H. A.

AU - Fareed, M. A.

AU - Laramée, A.

AU - Ropagnol, X.

AU - Zhang, G.

AU - Sun, S.

AU - Sheng, Z. M.

AU - Zhang, J.

AU - Ozaki, T.

PY - 2017/1/10

Y1 - 2017/1/10

N2 - We demonstrate an intense broadband terahertz (THz) source based on the interaction of relativistic-intensity femtosecond lasers with aligned copper nanorod array targets. For copper nanorod targets with a length of 5 μm, a maximum 13.8 times enhancement in the THz pulse energy (in ≤20 THz spectral range) is measured as compared to that with a thick plane copper target under the same laser conditions. A further increase in the nanorod length leads to a decrease in the THz pulse energy at medium frequencies (≤20 THz) and increase of the electromagnetic pulse energy in the high-frequency range (from 20–200 THz). For the latter, we measure a maximum energy enhancement of 28 times for the nanorod targets with a length of 60 μm. Particle-in-cell simulations reveal that THz pulses are mostly generated by coherent transition radiation of laser produced hot electrons, which are efficiently enhanced with the use of nanorod targets. Good agreement is found between the simulation and experimental results.

AB - We demonstrate an intense broadband terahertz (THz) source based on the interaction of relativistic-intensity femtosecond lasers with aligned copper nanorod array targets. For copper nanorod targets with a length of 5 μm, a maximum 13.8 times enhancement in the THz pulse energy (in ≤20 THz spectral range) is measured as compared to that with a thick plane copper target under the same laser conditions. A further increase in the nanorod length leads to a decrease in the THz pulse energy at medium frequencies (≤20 THz) and increase of the electromagnetic pulse energy in the high-frequency range (from 20–200 THz). For the latter, we measure a maximum energy enhancement of 28 times for the nanorod targets with a length of 60 μm. Particle-in-cell simulations reveal that THz pulses are mostly generated by coherent transition radiation of laser produced hot electrons, which are efficiently enhanced with the use of nanorod targets. Good agreement is found between the simulation and experimental results.

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KW - copper nanorod arrays

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KW - femotosecond lasers

KW - terahertz radaiation

KW - imaging

KW - laser-plasma interaction

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