Descrição
The high demand for new materials with enhanced optical features has led to a growing interest in molecular nonlinear optics. This area of research has facilitate the creation of more efficient materials and a decrease in the cost of recent technologies. In particular, the macromolecules has received a special attention due your high symmetry breaking being a excellent candidate for presents a great values of second order optical susceptibility χ2. (1) The polybinaphthalenes has a ideal macromolecular structure to link differents chromophores to optimize the nonlinear optical responses. (2) In this context, we determined the spectral dependence of the first order molecular hyperpolarizability β(λ) of four donor-embedded polybinaphthalenes (DEP) structures in solution. For this, we apply the tunable femtosecond Hyper Rayleigh Scattering (HRS) technique. (3) The results show high β values for all studied macromolecules, with peak values ranging from 2500 to 16000 (x10-30cm4statV-1). Concerning the values of β for pNA molecule, the (DEP) are c.a. 25 to 160 times higher at the enhancement resonance region. This giant molecular second harmonic generation makes these class of macromolecules an exceptional candidates for photonic devices, such as, in the fabrication of highly efficient organic crystals for second harmonic generation.
Referências
1 KOECKELBERGHS, G. et al. Synthesis and properties of chiral chromophore-functionalized polybinaphthalenes for nonlinear optics: influence of chromophore concentration. Macromolecules, v. 36, n. 26, p. 9736-9741, 2003. DOI: http://dx.doi.org/10.1021/ma0351118.
2 KOECKELBERGHS, G. et al. Donor-embedded polybinaphthalenes for nonlinear optical applications: influence of the incorporation of a double bond. Macromolecular Rapid Communications, v. 26, n. 11, p. 905-910, 2005. DOI: http://dx.doi.org/10.1002/marc.200500022.
3 CLAYS, K.; PERSOONS, A. Hyper-rayleigh scattering in solution. Physical Review Letters, v. 66, n. 23, p. 2980-2983, 1991. DOI: http://dx.doi.org/10.1103/PhysRevLett.66.2980.
| Certifico que os nomes citados como autor e coautor estão cientes de suas nomeações. | Sim |
|---|---|
| Palavras-chave | First order molecular hyperpolarizability β. HRS second harmonic generation. Supramolecular. |
| Orientador e coorientador | Leonardo De Boni |
| Subárea 1 | Física da Matéria Condensada |
| Subárea 2 (opcional) | Fotônica |
| Agência de Fomento | CAPES |
| Número de Processo | 88887.506484/2020-00 |
| Modalidade | DOUTORADO |
| Concessão de Direitos Autorais | Sim |
