Increased reverse energy flux area when focusing a linearly polarized annular beam with binary plates

We suggest an annular field with linear polarization and a binary sectored phase for the formation of the inverse energy flux with an increased area of action. The possibility of the formation of a reverse energy flux over large areas in the focal domain at tight focusing of a linearly polarized field with the binary phase is shown theoretically and numerically. Moreover, the area increases with the number m. The proposed approach is simple, because linearly polarized radiation is the most common among laser sources and does not require additional devices for polarization transformations. The binary phase also provides ease of manufacture of phase plates with a high diffraction efficiency and high damage threshold. The results will be useful in optical manipulations and processing.