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Noble metal nanoparticles,such as gold and silver,are known to display interesting phenomenon called Plasmon resonance,which could be utilized to enhance linear and nonlinear optical properties of nearby chromophores and metal nanoparticles themselves.Here I will present our recent studies on plasmon coupling enhanced two-photon photoluminescence and their various applications.Our group recently found an interesting phenomenon that non-fluorescence metal nanoparticles started to emit strong two-photon photoluminescence (TPPL) upon plasmon coupling in the aggregated state [1].TPPL of these plasmonic metal nanoparticles was found to be enhanced by hundreds of times (in colloid) up to five orders of magnitude (on single particle level) upon plasmon coupling [1-6].As many biological species could cause aggregation and plasmon coupling of metal nanoparctile,plasmon coupling enhanced TPPL could be utilized to developed variosu schemes for biological applications [4-5].We have further employed ultrafast spectroscopy techniques to understand the underlying enhancement mechanisms [6].