Nonlinear refractive index and three-photon absorption coefficient of poly(9,9-dioctylfluorence)

Jang, J. I.; Mani, S.; Ketterson, J. B.; Lovera, P.; Redmond, G.
November 2009
Applied Physics Letters;11/30/2009, Vol. 95 Issue 22, p221906
Academic Journal
We investigate the optical Kerr effect and third harmonic generation (THG) arising from χ(3) of poly(9,9-dioctylfluorence), which is an emerging organic π-conjugated polymer from the perspective of diverse optoelectronic applications. The measured nonlinear refractive index, obtained with closed-aperture Z-scan, is n2=(2.04±0.10)×10-12 esu at λ=1540 nm. Open-aperture Z-scan yields the three-photon absorption coefficient of γ=(1.88±0.26)×10-3 cm3/GW2 at λ=1064 nm, arising from χ(5) response. The wavelength-dependent THG indicates that this semiconducting polymer can be a potentially useful polymer system for nonlinear-optics applications involving high-order optical processes in the mid-IR range.


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