Abstract.
Dark hollow focus plays an important role in many optical systems. In this paper, dark hollow focal shaping of spirally polarized axisymmetric Bessel-modulated Gaussian beam is investigated by vector diffraction theory in detail. Results show that the dark hollow focus can be altered considerably by beam parameter and spiral parameter that indicates polarization spiral degree. One dark hollow focus and two dark hollow foci pattern may occur for certain spiral parameter, and the transverse size of dark hollow focus can be less than the diffraction limit size of bright focus. In addition, there may also appear two triangle dark hollow foci that are connected by one dark line focus.
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Gao, X., Zhan, Q., Wang, Q. et al. Subwavelength dark hollow focus of spirally polarized axisymmetric Bessel-modulated Gaussian beam. Eur. Phys. J. D 64, 103–108 (2011). https://doi.org/10.1140/epjd/e2011-10703-6
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DOI: https://doi.org/10.1140/epjd/e2011-10703-6