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Top: Emission spectra of 10−4 M rhodamine B between silver island films with two-photon excitation at 852 nm (−). Also shown are the signals observed for uncoated quartz slides (---) or silver islands alone without rhodamine B (⋯). Bottom: RhB between silver islands (−) or quartz plates (---) with one-photon excitation at 490 nm, observed through a long-pass 540 nm and BG-38 emission filter.
