Spatial imaging of modifications to fluorescence lifetime and intensity by individual Ag nanoparticles
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(Color online) [(a) and (b)] AFM images of Ag nanoparticles formed from single and double layers of latex spheres, respectively. Scale and the height contrast is for both. [(c) and (d)] Confocal cw fluorescence intensity maps of R6G deposited on nanoparticle regions similar to (a) and (b), respectively. (e) Ensemble extinction spectra from single and double layer Ag nanoparticle arrays showing dipole and quadrupole plasmon resonances. The high-frequency noise is from interference in the glass slide.
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(Color online) Fluorescence lifetime analysis for a region of double layer nanoparticles: (a) Raw decay transients from R6G on glass and nanoparticles; the straight line is a linear fit to the glass data. (b) Reflected laser intensity from a small scan area; scale bar is . (c) Histogram of lifetime components obtained from biexponential pixel fits of the scan area. (d) Spatial map of the normalized preexponential intensity for the component. (e) as (d) for the component showing homogeneity across the region. Note the difference in the relative intensity scales. (f) Pixel-by-pixel correlation between spatial maps of and associated values for a area of nanoparticles. The color bar gives the binned frequency, and the line is a linear best fit.
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