Abstract
We propose a method for configuring the distribution of amplitude, phase, and
polarization in the focal region of vector beams. The polarization and phase of
incident beam is spatially tailored so that it can produce a focal field that has
elaborately prescribed shapes. Our work focuses on the design of a special focus
structure with two oval rings, wherein a phase gradient and polarization gradient
exist in the inner and outer rings, respectively. The incident light yielding the
desired focal field is determined based on an iterative scheme involving vectorial
diffraction calculations and fast Fourier transforms. Simulations and experiments
demonstrate the generation of a focal field with phase and polarization gradients,
which may find applications in optical manipulation.
© 2014 Chinese Optics Letters
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