Physical picture, pattern-control, and detection approach for tightly focused beams: In the view of Fourier optics

摘要

We investigate the mechanism of the nonparaxial propagation of the tightlyfocused beams in the view of Fourier optics. It shows that it is the phase ofthe angular spectrum which induces the interesting evolution of the tightlyfocused beams. Based on the theory of Fourier optics, we propose an approach oncontrolling and detecting the focusing spot of the tightly focused beams.