Generation of orbital angular momenta of photons by transformation media

Details Generation of orbital angular momenta of photons by transformation media Generation of orbital angular momenta of photons by transformation media

2010-06-15

arxiv.org/abs/1006.2932v5

Physics

Optics

4 pages, 9 figures

Scientific paper

To enable an optical beam to carry orbital angular momenta (OAM) it is necessary to form a helical wavefront on the beam. Here, we propose a scheme to generate photonic OAM by using a metamaterial cylinder, in which the transformation relation and the material parameters of the metamaterial are obtained based on transformation optics. Numerical simulations confirm the theoretical predictions and further demonstrate the ability of such a new scheme to generate arbitrary OAM of photons. The result provides a new route to manipulate the phase of electromagnetic fields and may be valuable in developing photonic devices based on OAMs.

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