Ultrafast variation of the polarized state in proton-& pi; electron coupled ferroelectric cocrystal Phz-H(2)ca

The photoexcitation dynamics of an organic ferroelectric phenazine-chloranilic cocrystal is studied using time-resolved reflectance and second harmonic generation (SHG) measurements. By exciting intramolecular transition, ultrafast variations of reflectivity and SHG are observed, which are discussed based on the scenario of growth of polarization inversion domains proposed theoretically.