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

作者：Jang J I^*; Mani S; Ketterson J B; Lovera P; Redmond G

来源：Applied Physics Letters, 2009, 95(22): 221906.

DOI：10.1063/1.3269588

• absorption coefficients
• conducting polymers
• optical harmonic generation
• optical Kerr effect
• organic semiconductors
• refractive index

We investigate the optical Kerr effect and third harmonic generation (THG) arising from chi((3)) of poly(9,9-dioctylfluorence), which is an emerging organic pi-conjugated polymer from the perspective of diverse optoelectronic applications. The measured nonlinear refractive index, obtained with closed-aperture Z-scan, is n(2)=(2.04 +/- 0.10)x10(-12) esu at lambda=1540 nm. Open-aperture Z-scan yields the three-photon absorption coefficient of gamma=(1.88 +/- 0.26)x10(-3) cm(3)/GW(2) at lambda=1064 nm, arising from chi((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.

• 出版日期2009-11-30
• 单位西北大学