The investigation of third-order hyperpolarizabilities and susceptibilities of push-pull azobenzene polymers
Transparent Optical Networks（2013）
摘要
To estimate the potential for third-order nonlinear optical (NLO) properties of the title azobenzene polymers, the one-photon absorption (OPA) and two-photon absorption (TPA) characterizations have been determined by configuration interaction (CI) and time-dependent Hartree-Fock (TDHF) methods, respectively. The nonlinear absorption parameters (β) and third-order susceptibilities (χ(3)) have been measured by performing the Z-scan measurements. According to the ab-initio computation results, the investigated compounds exhibit averaged (isotropic) second hyperpolarizabilities (〈γ〉) with non-zero values, implying microscopic third-order optical nonlinearity. Our computed results on TPA cross-sections (δ(ω)), third-order hyperpolarizability and susceptibility values are in accord with the experimental observations of the examined molecules.
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关键词
hf calculations,ab initio calculations,configuration interactions,nonlinear optical susceptibility,nonlinear optics,optical polymers,two-photon processes,nlo,opa,tpa,tpa cross-sections,z-scan measurements,ab-initio computation results,configuration interaction method,microscopic third-order optical nonlinearity,nonlinear absorption parameters,one-photon absorption,push-pull azobenzene polymers,second hyperpolarizabilities,susceptibilities,susceptibility values,third-order hyperpolarizabilities,third-order susceptibilities,time-dependent hartree-fock method,title azobenzene polymers,two-photon absorption,z-scan technique,second hyperpolarizability,third-order susceptibility,plastics,z scan technique,two photon absorption,absorption,optical imaging
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