Wide-field fluorescence image of the PCP complexes on 0.6-μm-diameter silica nanoparticles and their fluorescence intensity. (a) Wide-field fluorescence image of the PCP complexes deposited on silica nanoparticles with a diameter of 0.6 μm. Excitation wavelength was 480 nm. (b) Histogram of the fluorescence intensity calculated from the wide-field fluorescence image. (c) Cross section of the fluorescence intensity obtained along the black line 1 for the three nanoparticles shown in Figure 3a.