Iketaki Yoshinori, Watanabe Takeshi, Bokor Nándor, Fujii Masaaki
Olympus Corporation, Hachioji-shi 192-8512, Japan.
Opt Lett. 2007 Aug 15;32(16):2357-9. doi: 10.1364/ol.32.002357.
The vectorial Debye integral shows that tightly focused Laguerre-Gaussian (LG) beams have a residual intensity at the focal point for linear polarization, for a topological charge of m=1 and 2. We measured the shapes of linearly and circularly polarized LG beams and found that a central intensity appeared at m=1 and 2 for linear and right-handed circular polarization, however, it is completely canceled for left-handed circular polarization. In general, when the orbital angular momentum of the LG beam is parallel to the spin angular momentum of the photons, zero intensity is always achieved at the focus.
矢量德拜积分表明，对于拓扑电荷(m = 1)和(2)的情况，紧聚焦拉盖尔 - 高斯（LG）光束在焦点处对于线偏振存在残余强度。我们测量了线偏振和圆偏振LG光束的形状，发现对于线偏振和右旋圆偏振，在(m = 1)和(2)时会出现中心强度，然而，对于左旋圆偏振，中心强度完全被抵消。一般来说，当LG光束的轨道角动量与光子的自旋角动量平行时，在焦点处总是能实现零强度。
