Light beams where different degrees of freedom cannot be described independently have raised great interest in the last few years, since some of their properties resemble certain features of quantum entangled states. What this comparison really means, and how far one can go with it, is a matter of lively discussion. However, these considerations provide a different perspective on the light beams themselves, shining light on the intricate behavior of complex light beams. One case of interest are structured light beams where the description of the polarization and spatial shape cannot be separated. The experiments performed by K. Singh et al. go in this direction. With the help of a digital micro-mirror device, used to replicate a vectorial axicon, they generate Bessel beams and are able to observe different types of interference, in intensity and polarization structure, and at different locations. The different types of interference observed are understood with the help of the Arago-Fresnel laws. The present work shows how much we have advanced in recent years in our capacity to engineer light beams with complex structures in polarization, amplitude and phase.
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