title: Nonlinear optical properties tuning in meso-tetraphenylporphyrin derivatives substituted with donor/acceptor groups in picosecond and nanosecond regimes.
abstract: meso-Tetraphenylporphyrin (TPP) and its two substituted derivatives (meso-tetrakis(4-cyanophenyl)porphyrin [TPP(CN)4] and meso-tetrakis(4-methoxyphenyl)porphyrin [TPP(OMe)4]) were synthesized. Their nonlinear absorption and refraction properties were studied using the Z-scan technique in the picosecond (ps) and nanosecond (ns) regimes. The open aperture Z-scan results reveal that TPP and TPP(CN)4 display an identical reverse saturable absorption (RSA) character in the ps and ns regimes. While TPP(OMe)4 exhibits a transition from saturable absorption (SA) to RSA in the ps regime and a typical RSA character in the ns regime. The closed aperture Z-scan results show that TPP(CN)4 and TPP(OMe)4 have regular enhancement of the magnitude of nonlinear refraction as compared to their parent TPP in both the ps and ns regimes. In addition, the second-order molecular hyperpolarizabilities (γ) of these three porphyrins are calculated, and the γ values of TPP(CN)4 and TPP(OMe)4 are remarkable larger than that of TPP. The introduction of the electron-withdrawing group CN and the electron-donating group OMe into TPP has enhanced its nonlinear refraction and γ value, and tuned its nonlinear absorption (TPP(OMe)4), which could be useful for porphyrin-related applications based on the desired NLO properties.
authors.affiliation: Department of Physics, Harbin Institute of Technology, Harbin 150001, China. aghoptics@163.com.
authors.forename: Guanghong
authors.initials: G
authors.lastname: Ao
authors.affiliation: Department of Physics, Harbin Institute of Technology, Harbin 150001, China. xiangyunonlinear@gmail.com.
authors.forename: Zhengguo
authors.initials: Z
authors.lastname: Xiao
authors.affiliation: Department of Physics, Harbin Institute of Technology, Harbin 150001, China. xmqian@hit.edu.cn.
authors.forename: Xuemin
authors.initials: X
authors.lastname: Qian
authors.affiliation: Department of Physics, Harbin Institute of Technology, Harbin 150001, China. claes.lee@gmail.com.
authors.forename: Zhongguo
authors.initials: Z
authors.lastname: Li
authors.affiliation: Department of Physics, Harbin Institute of Technology, Harbin 150001, China. wangyx@hit.edu.cn.
authors.forename: Yuxiao
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Physics, Harbin Institute of Technology, Harbin 150001, China. xrzhang@hit.edu.cn.
authors.forename: Xueru
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Department of Physics, Harbin Institute of Technology, Harbin 150001, China. ylsong@hit.edu.cn.
authors.forename: Yinglin
authors.initials: Y
authors.lastname: Song
mesh_terms: D015394:Molecular Structure; D055620:Optical Phenomena; D011166:Porphyrins / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D011166:Porphyrins; C049692:tetraphenylporphine
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