Lucien E. Weiss, Boris Ferdman, Onit Alalouf, Y. Shechtman
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Label-Free Biosensing by Ultrasensitive Supercritical Angle Refractometry
By imaging the back focal plane of a fluorescence microscope, we demonstrate precise determination of a sample’s refractive index in a fluorophore-laden microfluidic device. We apply the technique to biosensing by detecting unlabeled bacteria.