拉盖尔-高斯光束在左手材料中的反向传输动力学
Reversed propagation dynamics of Laguerre-Gaussian beams in left-handed materials
摘要：
基于角谱表示，研究了拉盖尔-高斯光束在左手材料中的反向传输动力学。结果表明，负相速度引起波前的反向螺旋，并最终导致光学涡旋的反向旋转。此外，负的古伊相移导致坡印廷矢量的逆螺旋。结果表明，拉盖尔-高斯光束在左手材料中的传输特性与在规则右手材料中具有相反拓扑荷的拉盖尔-高斯光束的传输特性相同。动量守恒定理保证了在RHM-LHM边界处的波动量的切向分量是守恒的。结果表明，虽然线动量的方向发生了逆转，但角动量保持不变。
英文摘要：
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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