Metamaterial-based polarization scrambler for uniform illumination of laser beam

Details Metamaterial-based polarization scrambler for uniform illumination of laser beam Metamaterial-based polarization scrambler for uniform illumination of laser beam

2011-08-19

arxiv.org/abs/1108.3954v1

Physics

Optics

6 pages, 5figures

Scientific paper

The uniform illumination of laser beam is imperative to inertial confinement fusion. As a uniform illumination technique, polarization smoothing reduces the beam non-uniformity by creating two orthogonally polarized beams with a selected angular separation or by an optic which scrambles the polarization in the near field. Here, we propose and demonstrate a metamaterial-based polarization scrambler for improving the illumination uniformity of laser beam by exploiting the ability of metamaterial in local polarization manipulation of beam upon transmission by tuning its local geometry. As a proof-of-principle, we exemplify this idea numerically in a simplified beam smoothing system using a typical L-shaped plasmonic metamaterial with locally varying structure geometry, from which the desired far-field polarization distribution can be obtained. The calculating results illustrate that this scrambler can effectively suppress the small-scale non-uniformity of the speckle pattern and shows a nearly same smoothing effect as conventional polarization smoothing methods. These results suggest higher degrees of freedom for designing beam smoothing devices compared to traditional ways.

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