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Updated: May 18, 2026

Polarization-Sensitive Two-Photon Microscopy for a Label-Free Amyloid Structural Characterization
Published on: September 8, 2023
Polarization effect on the two-photon absorption of a chiral compound
M G Vivas1, L De Boni, Y Bretonniere
1Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, SP, Brazil. mavivas82@yahoo.com.br
Abstract:
In this report, we investigate the polarization effect (linear, elliptical and circular) on the two-photon absorption (2PA) properties of a chiral compound based in azoaromatic moieties using the femtosecond Z-scan technique with low repetition rate and low pulse energy. We observed a strong 2PA modulation between 800 nm and 960 nm as a function the polarization changes from linear through elliptical to circular. Such results were interpreted employing the sum-over-essential states approach, which allowed us to model the 2PA circular-linear dichroism effect and to identifier the overlapping of the excited electronic states responsible by the 2PA allowed band.
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