Physics – Optics
Scientific paper
2009-05-20
Physical Review A 80, 043810 (2009)
Physics
Optics
7 pages, 4 figures
Scientific paper
10.1103/PhysRevA.80.043810
We establish a general propagation model to describe the spin Hall effect of light beam in left-handed materials (LHMs). A spin-dependent shift of the beam centroid perpendicular to the refractive index gradient for the light beam through an air-LHM interface is demonstrated. For a certain circularly polarized component, whether the transverse shift is positive or negative depends on the magnitude of the refractive index gradient. Very surprisingly, the spin Hall effect in the LHM is unreversed, although the sign of refractive index gradient is reversed. The physics underlying this counterintuitive effect is that the spin angular momentum of photons is unreversed. Further, we reveal that the angular shift in the LHM is reversed due to the negative diffraction. These findings provide alternative evidence for that the linear momentum of photons is reversed, while the spin angular momentum is unreversed in the LHM.
Fan Dianyuan
Luo Hailu
Shu Weixing
Tang Zhixiang
Wen Shuangchun
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