Figure 3
Point source emission near a ball with \(R/\lambda =15\), \(n_2=2\) located inside \(n_1=1\): (a) \(|E_z(x,y)|^2\) and (b) \({\text{psf}}(x,y)\). The distributions in both frames are normalized to the maximum of \({\text{psf}}(x,y)\) at \(x/\lambda =124\), \(y=0\). In frame (b) the dot shows the position of the point source and the dashed vertical line at \(x/\lambda =124\) defines the optimal image plane (diffraction focus).
