We propose an iterative method of energy flow shaping in the focal region
with the amplitude, phase and polarization modulation of incident light. By
using an iterative optimization based on the diffraction calculation with help
of the fast Fourier transform, we can tailor the polarization and phase
structure in the focal plane. By appropriate design of the polarization and
phase gradients, arbitrary energy flow including spin and orbital parts can be
designed and tailored independently. The capability of energy flow structuring
is demonstrated by the measurement of the Stokes parameters and
self-interference pattern. This provides a novel method to control the
vectorial feature of the focal volume.
