Research at the Mathematical Optics Group uses "twisted" light to study new quatum-based information security systems. In order to understand the structure of "twisted" light, it is useful to start with an ordinary light beam with zero twist, namely a plane wave.
Reference:
Forbes, A, Dudley, A.L. and Roux, S. 2010. Twisted light. EngineerIT (2010), pp 63-64
Forbes, A., Dudley, A. L., & Roux, S. (2010). Twisted light. http://hdl.handle.net/10204/5205
Forbes, A, Angela L Dudley, and S Roux "Twisted light." (2010) http://hdl.handle.net/10204/5205
Forbes A, Dudley AL, Roux S. Twisted light. 2010; http://hdl.handle.net/10204/5205.
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