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THz Induced Nonlinear Effects in Materials at Intensities above 26 GW/cm2

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2018

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Woldegeorgis, Abel
Beleites, Burgard
Bossert, Jörg
Grosse, R.
Paulus, Gerhard G.
Ronneberger, Falk
Gopal, Amrutha

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https://doi.org/10.1007/s10762-018-0493-3
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Journal of Infrared, Millimeter, and Terahertz Waves. 2018, 39(7), pp. 667-680. ISSN 1866-6892. eISSN 1866-6906. Available under: doi: 10.1007/s10762-018-0493-3

Zusammenfassung

Nonlinear refractive index and absorption coefficient are measured for common semiconductor material such as silicon and organic molecule such as lactose in the terahertz (THz) spectral regime extending from 0.1 to 3 THz. Terahertz pulses with field strengths in excess of 4.4 MV/cm have been employed. Transmittance and the transmitted spectrum were measured with Z-scan and single shot noncollinear electro-optic pump-probe techniques. The THz-induced change in the refractive index (Δn) shows frequency-dependence and a maximum change of − 0.128 at 1.37 THz in lactose and up to + 0.169 at 0.15 THz in silicon was measured for a peak incident THz intensity of 26 GW/cm2. Furthermore, the refractive index variation shows a quadratic dependence on the incident THz field, implying the dominance of third-order nonlinearity.

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ISO 690WOLDEGEORGIS, Abel, Takayuki KURIHARA, Burgard BELEITES, Jörg BOSSERT, R. GROSSE, Gerhard G. PAULUS, Falk RONNEBERGER, Amrutha GOPAL, 2018. THz Induced Nonlinear Effects in Materials at Intensities above 26 GW/cm2. In: Journal of Infrared, Millimeter, and Terahertz Waves. 2018, 39(7), pp. 667-680. ISSN 1866-6892. eISSN 1866-6906. Available under: doi: 10.1007/s10762-018-0493-3
BibTex
@article{Woldegeorgis2018-07Induc-43348,
  year={2018},
  doi={10.1007/s10762-018-0493-3},
  title={THz Induced Nonlinear Effects in Materials at Intensities above 26 GW/cm<sup>2</sup>},
  number={7},
  volume={39},
  issn={1866-6892},
  journal={Journal of Infrared, Millimeter, and Terahertz Waves},
  pages={667--680},
  author={Woldegeorgis, Abel and Kurihara, Takayuki and Beleites, Burgard and Bossert, Jörg and Grosse, R. and Paulus, Gerhard G. and Ronneberger, Falk and Gopal, Amrutha}
}
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