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Refractive index calibration plot for an unmodified 38 μm WGM resonator in a stirred 10 μL water droplet. Injections of 1.7 M NaCl stock solution were used to increase refractive index in the drop. The calibration plot indicates a linear response (R2 = 0.995) and measured limit of detection of 6.2 × 10−4 RIU. Error bars represent intra assay variability (N = 3).
