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Responses when the bimetallic layer consisting of a silver layer 31 nm thick and a gold layer 15 nm thick for different applied potential levels ranging from −0.2 V to 0.2 V and the incident angles of sinθ0 of 0.90, 0.92, 0.94 and 0.96. (a) Minimum reflectance intensity level at the plasmonic wavelengths min(Rp); (b) full width half maximum; (c) Sensitivity; and (d) Figure of Merit.
