Spectral dependence of nonlinear absorption and refraction in terthiophene-based organic semiconductors

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• 作者：Leszek Mazur^a ; ^b ; Radoslaw Kolkowski^a ; ^c ; Katarzyna Matczyszyn^a ; ^{katarzyna.matczyszyn@pwr.wroc.pl} ; Fabrice Mathevet^b ; Patrice Rannou^d ; Andre-Jean Attias^b ; Marek Samoc^a
• 关键词：Z-scan ; Hyperpolarizability ; Two-photon absorption ; Organic semiconductors ; 蟺-Conjugated materials
• 刊名：Optical Materials
• 出版年：2012
• 期刊代码：81_09253467
• 类别：ch
• 出版时间：August, 2012
• 卷：34
• 期：10
• 页码：1682-1685
• 文件大小：476 K

摘要

We present results related to the determination of third-order nonlinear optical (NLO) properties of three organic semiconductors (OSCs) with a 蟺-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 纬 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 (鈭?50 nm) but appreciable two-photon absorption cross sections (蟽₂ 鈮?#xA0;120 GM) close to 600 nm.