Negative refraction and backward wave in chiral mediums: Illustrations of Gaussian beams

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[1] Chern, Ruey-Lin
[2] Chang, Po-Han
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| 1600年 / American Institute of Physics Inc.卷 / 113期
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We investigate the phenomena of negative refraction and backward wave in chiral mediums; with illustrations of Gaussian beams. Due to symmetry breaking intrinsic in chiral mediums; there exist two circularly polarized eigenwaves with different wave vectors. The two waves begin to split from each other as the chirality parameter increases from zero. The right (left)-handed circularly polarized wave tends to move toward (away from) the normal to the interface. As the chirality exceeds a critical value; the left-handed wave is flipped to the other side of the interface normal; that is; negatively refracted; and becomes a backward wave. These features are illustrated with Gaussian beams based on Fourier integral formulations. The special condition of perfectly negative refraction in chiral mediums is also discussed. © 2013 AIP Publishing LLC;
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