Surface Plasmon Resonance (SPR)
Zhang et al. have shown a smartphone biosensor platform using SPR. The disposable sensor chip utilizes the smartphone’s built in flash as a light source and a compact diffraction grating and spectra dispersive unit 106, but this technology is still in development. Recent publication regarding antibiotic mediated plasmonic biosensors for endotoxin detection have shown a low limit of detection of 0.4 ng/ml 107.