Details

Autor(en) / Beteiligte

• dos Santos, Carlos H. D.
• Zucolotto Cocca, Leandro H.
• Pelosi, André Gasparotto
• Batista, Vasco F.
• Pinto, Diana C. G. A.
• Faustino, M. Amparo F.
• Vivas, Marcelo G.
• de Paula Siqueira, Jonathas
• Mendonça, Cleber R.
• De Boni, Leonardo

Titel

Observation of the two-photon transition enhanced first hyperpolarizability spectra in cinnamaldehyde derivatives: A femtosecond regime study

Ist Teil von

• The Journal of chemical physics, 2023-06, Vol.158 (21)

Ort / Verlag

United States: American Institute of Physics

Erscheinungsjahr

2023

Quelle

AIP Journals (American Institute of Physics)

Beschreibungen/Notizen

• The application of nonlinear optical effects in optoelectronic devices is still scarce because the irradiance threshold necessary to induce a specific effect is very high. In this context, knowing the frequency-resolved first order molecular hyperpolarizability (β) is essential to identifying regions where this response is intense enough to allow for applications in commercial devices. Thus, herein, we have determined the β spectral dependence of five new push–pull cinnamylidene acetophenone derivatives using femtosecond laser-induced Hyper-Rayleigh Scattering (HRS). A considerable increase in β values was observed in molecules. We found remarkable β values in regions near the two-photon resonance, which are mediated by electron withdrawing and donating groups. This effect was mapped using wavelength-tunable femtosecond Z-scan technique. Furthermore, it was modeled in light of the sum-over-states approach for the second- and third-order nonlinearities. Finally, our outcomes suggest a strategy to obtain large β values mediated by the 2PA transition.