Descrição
The first-order molecular hyperpolarizability (β) dispersion was measured using tunable femtosecond hyper-Rayleigh scattering (tHRS) technique in seven chalcone-based molecules. (1) A theoretical model for β dispersion based on photophysical parameters was also applied. (2) Due to the different substitution patterns of the aryl/heteroaryl rings on the chalcones strucure, different profiles of one and two-photon absorption spectra and β dispersion were observed. The applied model showed two important features for aiming high β values: (i) red-shifted one-photon and two-photon absorption bands and (ii) the number of absorption bands observed. To compare the results with other molecular structures, we employed the HRS figure of merit (FOM), which revealed that chemically engineered small chalcone molecules FOM is comparable to larger quadrupolar and octupolar ones. This clearly demonstrates that tunable femtosecond hyper-Rayleigh scattering measurements and its relationship with the absorptive photophysical parameters are essential for design and characterize nonlinear optical materials.
Referências
1 CLAYS, K.; PERSOONS, A. Hyper‐Rayleigh scattering in solution. Physical Review Letters, v. 66, n. 23, p. 2980-2983, June 1991.
2 SCIUTI, L. F. et al. Modeling the first-order molecular hyperpolarizability dispersion from experimentally obtained one- and two-photon absorption. Journal of Physical Chemistry A, v. 126, n. 14, p. 2152-2159, Apr. 2022.
| Certifico que os nomes citados como autor e coautor estão cientes de suas nomeações. | Sim |
|---|---|
| Palavras-chave | Tunable hyper-Rayleigh scattering. Chalcone-based molecules. Two-photon absorption spectra. |
| Orientador e coorientador | Orientador Leonardo De Boni |
| Subárea 1 | Física Atômica e Molecular |
| Subárea 2 (opcional) | Fotônica |
| Agência de Fomento | Sem auxílio |
| Número de Processo | Não se aplica |
| Modalidade | DOUTORADO |
| Concessão de Direitos Autorais | Sim |
