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Comparison of the WGM response in unstirred (A) and stirred (B) 10 μL nanopure water droplets following injection of saline to increase the refractive index 0.002 RIU. For measurements on actively mixed droplets, a 125 μm diameter glass rod was inserted into the drop and rotated at ~5000 rpm as shown in Figure 1C. With stirring, the WGM resonance establishes the new equilibrium value within seconds of the injection.
