Lee Sang-Hyuk, Roichman Yohai, Grier David G
Department of Molecular and Cell Biology, Institute for Quantitative Biology, University of California - Berkeley Berkeley, CA 94720-3220, USA.
Opt Express. 2010 Mar 29;18(7):6988-93. doi: 10.1364/OE.18.006988.
We introduce optical solenoid beams, diffractionless solutions of the Helmholtz equation whose diffraction-limited in-plane intensity peak spirals around the optical axis, and whose wavefronts carry an independent helical pitch. Unlike other collimated beams of light, appropriately designed solenoid beams have the noteworthy property of being able to exert forces on illuminated objects that are directed opposite to the direction of the light's propagation. We demonstrate this through video microscopy observations of a colloidal sphere moving upstream along a holographically projected optical solenoid beam.
我们引入了光学螺线管光束，它是亥姆霍兹方程的无衍射解，其衍射极限的面内强度峰值围绕光轴螺旋式传播，并且其波前携带独立的螺旋间距。与其他准直光束不同，经过适当设计的螺线管光束具有一项值得注意的特性，即能够对被照亮的物体施加与光传播方向相反的力。我们通过视频显微镜观察到一个胶体球沿着全息投影的光学螺线管光束向上游移动，从而证明了这一点。
