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(a) Intensity (yellow color) and phase (green color) profiles for 0.01 RIU change. (b) OPD contrast comparison between this plasmonic sensor (orange color) and a transparent substrate (grey color) for different thickness of SiO2 cover layer. Zoomed in range for thin SiO2 is plotted separately for this plasmonic sensor (left top plot) and a transparent substrate (left bottom plot). Adapted from [104], with permission © 2018 Springer Nature Publishing AG.
