(color online) Loading probability of single atom in optical microtrap as a function of spatial distribution of traps. (a) Experimental simulation of preparing single atom in a two-dimensional optical microtrap. Individual traps in these patterns have a close to unity in efficiency with lateral separation of 10 μm. Error bars represent the statistic results. Each point of experimental data is from the accumulation of at least 150 sequences. (b) The implementation range from several small traps to large-scale traps in three-dimensional space.