In Edward Collet's book "Polarized Light: Fundamentals and Applications", Chapter 3 states that: However, in recent years (as recent as 2008), I came across a paper published in Nature Photonics that a group of scientists, Haifeng Wang et al. from Data Storage Institute based in Singapore managed to generate a needle of longitudinally polarized light in free space with the help of binary optics and also radially polarized light. (nature photonics | VOL 2 | AUGUST 2008, Published online: 22 June 2008; doi:10.1038/nphoton.2008.127 pp. 501-505) The conclusion of the paper states that: My question is, does the creation of this longitudinal component actually violated Maxwell's Electrodynamic Theory? Is this phenomenon allowed in the Quantum theory? Thanks for the help on insight on this matter.