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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 25: Molecular Electronics and Excited State Properties II
CPP 25.4: Talk
Wednesday, March 20, 2024, 10:15–10:30, H 0111
Third-Order Nonlinear Optical Properties of N-Heteropolycycles — •Audrey Pollien1,2, Gabriel Sauter2, Kathleen Fuchs3, Uwe Bunz3, and Petra Tegeder2 — 1ENS Paris-Saclay, Paris-Saclay University, Gif-Sur-Yvette, France — 2Physikalisch-Chemisches Institut — 3Organisch-Chemisches Institut, Heidelberg University, Heidelberg, Germany
Third-order nonlinear optical (NLO) properties are observed in large π-conjugated organic molecules, characterized by the polarization of the material depending on the intensity of an applied electromagnetic field, giving rise to valuable properties such as two-photon absorption (TPA), self-focusing, or self-defocusing. Materials exhibiting third-order polarizability are essential for various photonics and optoelectronics applications, including bioimaging, three-dimensional microfabrication, optical data storage, optical limiting, and photodynamic therapy.
We show that open-shell N-heteropolycyclic compounds possess remarkable third-order NLO coefficients although they have a relatively small size and a metal-free nature compared to other molecules reported in the literature with such high properties. They are of particular interest due to their potential applications as photoinitiators and as chiral open-shell N-heteropolycycles in photonics. The third-order NLO properties of N-heteropolycyclic compounds are investigated using Z-scan techniques but also absorption, emission and fluorescence anisotropy measurements are performed for characterization.
Keywords: Nonlinear optics; N-heteropolycles; Open-Shell; Two-Photon Absorption