Surface plasmon excitation in a hollow prism

We design a hollow prism to excite surface plasmon. The prism is coated with polymethyl methacrylate (PMMA) containing rhodamine 6G (Rh6G) and 30 nm thick Ag film on the inner surface. After filling the hollow prism with alcohol and CS2, we measured the reflectance angle spectrum and observed the significant absorption, which indicates that the localized surface plasmon is excited at the Ag–PMMA interface. This hollow prism structure may be used in analyzing the composition and reaction process of the liquid or gas at the same time.