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Emission light from Ag/Rhodamine-B (RB) LB films due to surface plasmon (SP) excitations has been investigated using an attenuated total reflection (ATR) method and reverse irradiation of laser from air to samples. The conventional photoluminescence (PL) of the RB LB films showed broad spectrum and the peak wavelength was about 600nm. In the reverse irradiation, emission light was observed through the prism, and the intensities and the spectra strongly depended upon the emission angle where the light was observed. The wavelengths of the emission light became shorter as the emission angles increased. The relation between the wavelength and the angle corresponded to the resonant excitations of SPs in the ATR method. It was concluded that the emission light was caused by multiple xcitations of SPs. It was thought that a light emitting device with selective spectra would be fabricated utilizing the reverse irradiation.

Surface Plasmon Excitations at Metal-Organic Thin Films and Orientated Light Emission Properties