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(a) Schematic of the experimental setup. The microfluidic channel and the piezoelectric transducer were bonded to a glass slide with Au nanodisk arrays (Inset: Au nanodisk arrays on glass substrates). (b) Laminar flow of liquids with different refractive indices (in the absence of acoustic waves). (c) Fluid of combinatorial refractive index, resulting from mixture of two fluids actuated by acoustic waves.
