Figure 1

Image plane signal distribution for antibunching imaging of two fluorescent emitters. The units are arbitrary in both axes. The vertical lines denote the locations of the emitters. The solid blue line (top curve) is the regular fluorescent signal as a function of the image plane coordinate x, the dotted green line represents the variance given by Eq. (2), the dashed black line is the antibunching signal (3). The solid red line (bottom curve) shows the probability $F_2$(x) $=$ $P_1$(x)$P_2$(x) of a two-photon coincidence event with a sharp peak in the center. The dash-dotted red line shows the two-photon probability for two classical emitters $F_2^c$(x) $=$ ($P_1$(x) $+$ $P_2$(x))${}^2$/2, featuring a wider peak. The plots are calculated for $P_1$(x − 1) $=$ $P_2$(x $+$ 1) $=$ 0.4 exp(−$x^2/$2.25).Reuse & Permissions

Figure 2

A simulation of the second-order antibunching imaging. (a) Three emitters are positioned in the vertices of an equilateral triangle. The units are arbitrary, and the scale bar shows the full width at half maximum of the optical-point-spread function. (b) The regular fluorescence image does not resolve the emitters. (c) The second-order antibunching image. The emitters are clearly discerned. Both images were formed from ${10}^5$ frames, each corresponding to a single excitation cycle.Reuse & Permissions