Midinfrared third-harmonic generation from macroscopically aligned ultralong single-wall carbon nanotubes
2013; American Physical Society; Volume: 87; Issue: 16 Linguagem: Inglês
10.1103/physrevb.87.161405
ISSN1550-235X
AutoresDarius T. Morris, Cary L. Pint, Rolf S. Arvidson, Andreas Lüttge, Robert H. Hauge, Alexey Belyanin, Gary Woods, Junichiro Kono,
Tópico(s)Advanced Fiber Laser Technologies
ResumoWe report the observation of strong third-harmonic generation from a macroscopic array of aligned ultralong single-wall carbon nanotubes (SWCNTs) with intense midinfrared radiation. Through power-dependent experiments, we determined the absolute value of the third-order nonlinear optical susceptibility ${\ensuremath{\chi}}^{(3)}$ of our SWCNT film to be $5.53\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}12}$ esu, three orders of magnitude larger than that of the fused silica reference we used. Taking account of the filling factor of 8.75% for our SWCNT film, we estimate a ${\ensuremath{\chi}}^{(3)}$ of $6.32\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}11}$ esu for a fully dense film. Furthermore, through polarization-dependent experiments, we extracted all the nonzero elements of the ${\ensuremath{\chi}}^{(3)}$ tensor, determining the magnitude of the weaker tensor elements to be $\ensuremath{\sim}$1/6 of that of the dominant ${\ensuremath{\chi}}_{zzzz}^{(3)}$ component.
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