Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 429, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2022.113898
Keywords
Z-Scan technique; Hyperpolarizability; Chalcone; Nonlinear optics
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Funding
- Fundacao de Amparo a Pesquisa do Estado de Goias (FAPEG)
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Sisfoton/MCTI
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [2018/11283-7]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) [001]
- Army Research Laboratory [W911NF-17-1-0123]
- Air Force Office of Scientific Research [FA9550-12-1-0028]
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Organic molecules with second and third-order nonlinear optical properties have various applications in optics and photonics. Terpenoid-like chalcones derivatives are a suitable choice for nonlinear optical materials due to their wide range of compounds that can be used in biophotonic applications. This study investigates the first-order molecular hyperpolarizability and two-photon absorption cross-section of several terpenoid-like chalcones derivatives, aiming for applications in the therapeutic window. Experimental and modeling methods were employed to gain insights into the properties and structure-relationship of these compounds.
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 compounds 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 mutes 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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