DIRECT OBSERVATION OF TRANSFER OF ANGULAR-MOMENTUM TO ABSORPTIVE PARTICLES FROM A LASER-BEAM WITH A PHASE SINGULARITY
DIRECT OBSERVATION OF TRANSFER OF ANGULAR-MOMENTUM TO ABSORPTIVE PARTICLES FROM A LASER-BEAM WITH A PHASE SINGULARITY
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DOI：
10.1103/physrevlett.75.826
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发表时间：
1995-07-31
影响因子：
8.6
通讯作者：
RUBINSZTEINDUNLOP, H
中科院分区：
文献类型：
--
作者：
HE, H;FRIESE, MEJ;RUBINSZTEINDUNLOP, H
黑色或反射性颗粒可能被困在使用高效计算机产生的全息图产生的甜甜圈激光束的深度中心中。由于与中央相奇异性相关的螺旋波前结构，即使在线性极化时，此类梁具有角动量。由于从奇异束传递的这种角动量的吸收而导致的吸收颗粒旋转。旋转方向可以通过改变奇异性的迹象来逆转。
Black or reflective particles can be trapped in the dark central minimum of a doughnut laser beam produced using a high efficiency computer generated hologram. Such beams carry angular momentum due to the helical wave-front structure associated with the central phase singularity even when linearly polarized. Trapped absorptive particles spin due to absorption of this angular momentum transferred from the singularity beam. The direction of spin can be reversed by changing the sign of the singularity.