Angle-resolved Plane-polarized Reflection Spectra of Two-dimensional J-aggregate of Cyanine Dye Assembled on Ag (111) Film

Abstract

For two-dimensional J-aggregates of simple cyanine self-assembled on a halide-covered Ag (111) film, a series of angle-resolved reflection spectra were measured with both p-and s-polarized lights. The observed angle dependencies of the intensity of the J- band proved to be quantitatively explainable by assuming that the transition dipoles of the adsorbed dye molecules, lying parallel to the substrate surface, interact with the composite total electric field set up by interference between the incident beam and that reflected from the Ag (111) surface. Proper correction for this interference effect allowed the molar absorption coefficient of the two-dimensional J-aggregate (ε=5.0×10⁸mol^-1cm² at the peak of the J-band with about 15 nm FWHM) to be extracted from the apparent reflection absorbance at the normal incidence.