Wavelength and polarization dependence of hole-burning properties in highly oriented J-aggregates

J-aggregates of cyanine dyes show a sharp absorption peak, called J- band, below the transition band of monomers [1,2]. The band is due to the transition of excitons delocalized over an aggregate by intermolecular dipole interaction. A simple model of N identical molecules aligned in a one- dimensional chain has been proposed to explain the optical spectrum of the J- aggregates [3-5]. Recently, we have developed a new method, named "vertical spin-coating", to prepare highly oriented J-aggregates dispersed in polymer films [6]. Linear dichroic spectra, and electro-absorption spectra have been measured to study the optical properties of one-dimensional excitons in J- aggregates [7,8].