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. 2024 Sep 4;10(36):eadp7460. doi: 10.1126/sciadv.adp7460

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Fig. 1. — (A) Schematic of integrated plasmonic biosensor platform. Top inset shows specificity of surface-functionalized DNA aptamer in presence of other interfering species, where the aptamer binds selectively to dopamine. Bottom inset shows a cartoon representation of the plasmonic biosensor. (B and C) Scanning electron microscopy (SEM) image of the biosensor showing surface (B) and cross-sectional (C) view. (D and E) Finite-difference time-domain (FDTD)–predicted local electric near-field enhancement at λ = 842 nm, 2 nm above the surface (D) and cross section (bottom).