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(a) AFM image of four isolated AuNPs arranged into a line. The bidirectional arrow represents the incident electric vector. (b) AFM image of the four AuNPs after being pushed closer to each other by AFM manipulation. (c) SERS spectra of 4-MT adsorbed on the four AuNPs in (b) at different polarization angles. (d) Corresponding EF values of the four AuNPs in (a) and (b) at different polarization angles (laser wavelength is ).
(a)–(c) AFM images of three AuNPs before and after AFM manipulation. The scan size is . (d) Corresponding EF values for the three AuNPs. Solid squares, circles, and triangles represent the EF values of the AuNPs in (a), (b), and (c), respectively.
Enhancement factors vs the number of AuNPs. The solid circles and squares represent the EF values under parallel and perpendicular polarizations, respectively. The open circles and squares represent the corresponding logarithms of the EF values, respectively.
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