Second- and third-order nonlinear optical properties of mono-substituted terpenoid-like chalcones
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2022
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Organic molecules exhibiting second and third-order nonlinear optical properties (NLOP) allow several applications in optics and photonics. Among the class of organic compounds, terpenoid-like chalcones derivatives
constitute a suitable choice as nonlinear optical materials, given the possibility of obtaining a wide range of
compounds that can be used in biophotonic applications. In this way, here we present a study of the first-order
molecular hyperpolarizability and the two-photon absorption (2PA) cross-section of several terpenoid-like
chalcones derivatives, aiming for applications in the therapeutic window. The 2PA spectra were evaluated
employing the femtosecond tunable Z-Scan technique from 480 nm to 850 nm, and the first hyperpolarizability
was determined at 1064 nm using the Hyper-Rayleigh scattering (HRS) technique. Moreover, the first-order
molecular hyperpolarizability and the 2PA spectra were modeled by the sum-over-states (SOS) approach and
undamped phenomenological model, respectively, providing new insights into the properties and compoundś
structure relationship. Results showed that substituent features, such as electron-donating or withdrawing
ability, were associated with the 2PA cross-section magnitude. Regarding HRS results, it was possible to compare
the difference of state dipole moment from both approaches, combining two experimental routes to determine
photophysical parameters of non-fluorescent compounds, revealing the structure-relationship aiming the increase of the NLOP at the near-infrared region.
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Z-Scan technique, Hyperpolarizability, Chalcone, Nonlinear optics
Citação
MANOEL, Diego S. et al. Second- and third-order nonlinear optical properties of mono-substituted terpenoid-like chalcones. Journal of Photochemistry and Photobiology A: chemistry, Amsterdam, v. 429, e113898, 2022. DOI: 10.1016/j.jphotochem.2022.113898. Disponível em: https://www.sciencedirect.com/science/article/abs/pii/S1010603022001277?via%3Dihub. Acesso em: 29 set. 2023.