Electroabsorption spectroscopy of beta-carotene and alpha, omega-bis (1,1-dimethylheptyl)-1,3,5,7,9,11,13,15-hexadecaoctaene

摘要

We investigate the electric-field-induced change in the absorbance (i.e. electroabsorption response) of samples of beta-carotene and alpha, omega-bis(1,1-dimethylheptyl)-1,3,5,7,9,11,13,15-hexadecaoctaene dispersed in a polystyrene matrix. From the change in absorbance, the refractive index and the thickness of the polymer film, the third-order nonlinear d.c. Kerr susceptibility, x~(3)(-omega; 0,0,omega), can be calcualtedvia the Kramers-Kronig relationship. Results are also presented for the simulated electroabsorption of beta-carotene, derived from calculation of the absorption both in the presence and absence of an applied electric field.