کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1494777 | 992919 | 2012 | 4 صفحه PDF | دانلود رایگان |

We present results related to the determination of third-order nonlinear optical (NLO) properties of three organic semiconductors (OSCs) with a π-conjugated terthiophene (3Th) core and symmetrically or asymmetrically end-capped with specific terminals. The spectral dependences of the real and imaginary part of the cubic hyperpolarizability γ were obtained from Z-scan studies in the 600–1200 nm range. The 3Th-based OSCs show only moderate nonlinear absorption at twice the wavelength of the main one-photon absorption peaks (∼750 nm) but appreciable two-photon absorption cross sections (σ2 ≈ 120 GM) close to 600 nm.
► Three new end-capped terthiophenes were synthesized.
► Cubic nonlinear optical properties were determined using the Z-scan technique.
► Dispersion of the real and imaginary parts of the hyperpolarizability γ was shown.
► The peak two-photon absorption cross section values reach about 100 GM.
Journal: Optical Materials - Volume 34, Issue 10, August 2012, Pages 1682–1685