Analytical expressions for diffraction-free beams through an opaque diskQiulin Huang, Sebastien Coëtmellec, Fabrice Duval, Anne Louis, Herve Leblond and Marc BrunelJ. Eur. Opt. Soc.-Rapid Publ., 6 (2011) 11031DOI: https://doi.org/10.2971/jeos.2011.11031