Abstract
Hybrid plasmonic structures, which consist of metallic grating and nanoparticles, were fabricated by femtosecond laser processing. Surface plasmonic devices attracted much attention because of many potential applications in biosensing, energy conversion, and high density electronics. Silver nanoparticles less than one hundred nanometer were precipitated just above metallic gratings using femtosecond laser-induced plasmonic effect in AgNO_3 solution. The hybrid metallic structures exhibited much stronger fluorescence than metallic grating without nanoparticles in Rohdamine 6G solution, which means excitation light was effectively confined by plasmonic effects of the hybrid structures. Finite difference time domain calculation also suggested energy transfers from propagating plasmonic wave to localized modes around the nanoparticles.
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