Mechanical equivalence of spin and orbital angular momentum of light: An optical spanner
Mechanical equivalence of spin and orbital angular momentum of light: An optical spanner
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DOI：
10.1364/ol.22.000052
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发表时间：
1997-01-01
期刊：
影响因子：
3.6
通讯作者：
Padgett, MJ
中科院分区：
文献类型：
--
作者：
Simpson, NB;Dholakia, K;Padgett, MJ
我们使用光镊排列中的拉盖尔-高斯激光模式来演示激光模式的轨道角动量向捕获粒子的转移。粒子被光学限制在三维空间中，可以使其旋转；因此，该装置是一个光学扳手。我们证明了与圆偏振光相关的每个光子的+/- (h) / bar的自旋角动量可以与轨道角动量相加或相减，从而得到总角动量。观测到的自旋和轨道角动量的消去表明，正如所预测的那样，方位角指数为l = 1的拉盖尔-高斯模式具有一个定义良好的轨道角动量，对应于每光子(h) / bar。(C) 1997美国光学学会
We use a Laguerre-Gaussian laser mode within an optical tweezers arrangement to demonstrate the transfer of the orbital angular momentum of a laser mode to a trapped particle. The particle is optically confined in three dimensions and can be made to rotate; thus the apparatus is an optical spanner. We show that the spin angular momentum of +/- (h) over bar per photon associated with circularly polarized light can add to, or subtract from, the orbital angular momentum to give a total angular momentum. The observed cancellation of the spin and orbital angular momentum shows that, as predicted, a Laguerre-Gaussian mode with an azimuthal mode index l = 1 has a well-defined orbital angular momentum corresponding to (h) over bar per photon. (C) 1997 Optical Society of America