Fig. 4: Wearable plasmonic detection with an optical watch prototype. | Microsystems & Nanoengineering

Fig. 4: Wearable plasmonic detection with an optical watch prototype.

From: Portable and label-free optical detection of sweat glucose using functionalized plasmonic nanopillar array

Fig. 4: Wearable plasmonic detection with an optical watch prototype.

a the back of the optical watch prototype where the red dot is the LED and the one next to it is the photodiode. b The front of the optical watch prototype that indicate the wireless communication circuit and operational screen. c The measurement setup. d The normalized curve of reflected light intensity change relative to initial intensity shows the time-dependent sensing response of the Optical watch prototype to glucose solutions in artificial sweat of various concentrations (0–100 μmol/L). e Linear relationship between glucose concentration and intensity change/primary change (ΔI/I), with a LoD of 22 μmol/L. f Test results of 3 healthy volunteer sweat samples using Ag/SiNPs LSPR and Amplex™ Red Glucose Assay

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