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We made clean silver nano-clusters (AgNCs) on glass substrates by DC magnetron sputtering of a high purity Ag target in a high vacuum chamber. The AgNCs film shows strong localized surface plasmon resonance (LSPR) due to the coupling among Ag nanoparticles in the AgNCs and the coupling between AgNCs. The LSPR indicates strong coupling with Rhodamine 6G (R6G) adsorbed on the AgNC surface, which enhances the R6G absorption intensity and broadens the absorption wavelength range. This result promotes plasmonic nanoparticles to be better used in solar cells.