title: Polarization effect on the two-photon absorption of a chiral compound.
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.
authors.affiliation: Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, SP, Brazil. mavivas82@yahoo.com.br
authors.forename: M G
authors.initials: MG
authors.lastname: Vivas
authors.forename: L
authors.initials: L
authors.lastname: De Boni
authors.forename: Y
authors.initials: Y
authors.lastname: Bretonniere
authors.forename: C
authors.initials: C
authors.lastname: Andraud
authors.forename: C R
authors.initials: CR
authors.lastname: Mendonca
mesh_terms: D000042:Absorption; D002942:Circular Dichroism / Q000379:methods*; D003198:Computer Simulation; D008027:Light; D008420:Manufactured Materials / Q000032:analysis*; D008956:Models, Chemical; D017785:Photons; D012031:Refractometry / Q000379:methods*