Excitation of multiple surface plasmons and emission light in nanostructured molecular films

Surface plasmon (SP) excitations have been investigated in the attenuated total reflection (ATR) Kretschmann configuration of prism/metal /organic dye Langmuir-Blogett (LB) ultrathin films. Emission light through the prism was observed using direct irradiation of a laser beam from air to the LB films, that is, reverse irradiation. Intensities and spectra of the emission light through the prism strongly depended upon emission angles and nanostructures of dye LB films and metal ultrathin films in the Kretschmann configuration. The emission properties coincided with resonant conditions of SP excitations in the ATR Kretschmann configuration. It was thought that multiple SPs were excited at the interface of metal and LB films and some of multiple SPs were transferred to emission light corresponding to the resonant conditions of SPs in the ATR method. It is thought that the phenomenon due to multiple SP excitations is very useful for application to new devices.