We present an optical microfluidic mixing approach via thermally induced convective flow sustained by localized surface plasmon ( LSP ) energy. The phonon energy associated with the nonradiative damping of LSP from a Au nanoparticle ( NP ) array under optical excitation creates a thermal gradient which initiates a convective fluidic flow. Experimental evidence and modeling results both show that LSP from the Au NPs is crucial in establishing a temperature gradient with sufficient magnitude to induce the convective flow with low input optical intensity. (C) 2008 American Institute of Physics.
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