Here's the plot from their paper. Note that the horizontal axis, showing glucose concentration, is labelled in mlligram per milliliter, not per deciliter as you'd use in medicine. 500 milligram per milliliter is halfway to a saturated solution.
Also note how whilie it improves total SNR, their metasurface tech actually worsens the system's sensitivity to glucose level. It's funny-sad to read how they argue around that in the paper.
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