Reversed propagation dynamics of Laguerre-Gaussian beams in left-handed materials

Details Reversed propagation dynamics of Laguerre-Gaussian beams in left-handed materials Reversed propagation dynamics of Laguerre-Gaussian beams in left-handed materials

2007-08-20

arxiv.org/abs/0708.2623v2

Physical Review A 77, 023812 (2008)

Physics

Optics

7 pages, 4 figures

Scientific paper

10.1103/PhysRevA.77.023812

On the basis of angular spectrum representation, the reversed propagation dynamics of Laguerre-Gaussian beam in left-handed materials (LHMs) is presented. We show that negative phase velocity gives rise to a reversed screw of wave-front, and ultimately leads to a reversed rotation of optical vortex. Furthermore, negative Gouy-phase shift causes an inverse spiral of Poynting vector. It is found that the Laguerre-Gaussian beam in LHMs will present the same propagation characteristics as the counterpart with opposite topological charges in regular right-handed materials (RHMs). The momentum conservation theorem insures that the tangential component of the wave momentum at the RHM-LHM boundary is conserved. It is shown that although the linear momentum reverses its direction, the angular momentum remains unchanged.

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