An alternative approach to study light-matter interactions in nano-photonics is presented. This method is based on considering light and sample as a whole system and exploiting their symmetries. The mathematical formalism to systematically study symmetries of light beams is explained and particularly applied to vortex beams. Then, the method is used in two different problems. First, it is shown that vortex beams can be used to effectively turn any dielectric sphere into a dual material. Then, it is seen that the same light beams can be used to excite whispering gallery modes on free space, thus avoiding the evanescent coupling typically used in these kinds of problems.
|Number of pages
|Journal and Proceedings of the Royal Society of New South Wales
|Published - 2014