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(a) Full color (FC) dark-field image of 40 nm diameter gold NPs. (b) Corresponding FC extinction image Δ from 0 (black) to 0.043 (white). (c) Zoom of dark-field image. Corresponding zoom of the FC bright-field transmission with NP in focus I f (d) and out-of-focus I d (e). (f) Zoom of FC extinction image.
Distributions of for 104 GNPs of nominal 40 nm diameter in the R, G, and B color channels as indicated. The grey histograms show the noise distribution obtained by measuring in 183 randomly selected regions without NPs.
Scattering cross-section (stars) measured in dark-field images versus measured in extinction images for 40 nm GNPs and 100 nm GNPs in the green channel. The deduced absorption cross sections σabs are given as circles. The dotted line gives the fitted scaling as labeled. The limiting behaviour for small (dashed line) and large (solid line), and the expected absorption cross-section (short-dashed) are also shown.
Left column: Distributions of the amplitude α for 150 GNPs of 40 nm diameter in the R, G, and B color channels, and 320 GNPs of 100 nm diameter in the R channel. The distributions due to for GNPs of are given as black lines using as given in Fig. 2 . Right column: in the R channel with fits for two 40 nm GNPs, and distribution of the deduced amplitude parameter α by the measurement noise .
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