Abstract
We analyze the effect of spatial phase modulation using non-linear functions applied to singular warped beams to control their topological states and intensity distribution. Such beams are candidates for optical trapping and particle manipulation for their controllable pattern of intensities and singularities. We first simulate several kinds of warped beams to analyze their intensity profiles and propagation characteristics. Secondly, we experimentally validate the simulations and investigate the far-field profiles. By calculating the intensity gradients, we describe how these beams are qualified candidates for optical manipulation and trapping.
Highlights
Structured light and beam shaping have become an active research field in recent years, thanks to the advent of new technologies such as digital micro mirrors and spatial light modulators (SLM)
In a previous work [27] we introduced the tangent beams and proved that they have some interesting values of topological charge (TC) at the far field
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Summary
Structured light and beam shaping have become an active research field in recent years, thanks to the advent of new technologies such as digital micro mirrors and spatial light modulators (SLM). In a previous work we have analyzed the TC of these beams [27] and have discovered that the TC depends on the kind of wrapping of the tangent function. In this simulation, we propagated the wavefront using a numerical evaluation of the Fresnel integral with a propagation distance of z = 62 cm and a cross-section resolution of 10 μm. Igure 2 shows the intensity profiles for all Kinds using states 1 to 3
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