Focus splitting induced by a pure phase-shifting apodizer

Effect of a pure phase-shifting apodizer on the three-dimensional light intensity distribution in focal region is theoretically investigated in this paper. The results show that the proposed apodizer may induce focus splitting and local minimization of light intensity. By adjusting the geometrical parameters of the phase-shifting apodizer, the focus can split into two or three peaks. And one or two local minimums of light intensity may occur between two intensity peaks. Under the condition of two-peak focus, the distance between the peaks is tunable by the apodizer.

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