Fig. 6.

Evolution of the Péclet number with respect to $\alpha$ obtained numerically for a target at distance $r=98\sqrt{2}\mu \text{m}$ and $U_0=0.2\mu {\text{m.s}}^{-1}$. Yellow shows $D_r=0.2{\text{s}}^{-1}$ and $\mathrm{\Omega }=40{\text{s}}^{-1}$. Red shows $D_r=0.2{\text{s}}^{-1}$ and $\mathrm{\Omega }=20{\text{s}}^{-1}$. Blue shows $D_r=0.2{\text{s}}^{-1}$ and $\mathrm{\Omega }=10{\text{s}}^{-1}$. Green shows $D_r=0.1{\text{s}}^{-1}$ and $\mathrm{\Omega }=20{\text{s}}^{-1}$. ${\alpha }_R=0$ for all of the results shown here. The black curves correspond to the theoretical predictions given by Eq. 20, and the arrows indicate the maximum Péclet number. (Inset) Examples of numerical trajectories of a particle under feedback control for several values of tolerance angle: $\alpha =0.3$ (black), $1.1$ (blue), and $1.5$ (orange). The red circle corresponds to the position of the target.