论文标题
金属微粒的离轴光学捕获和横向旋转，线性极化高斯束
Off-axis optical trapping and transverse spinning of metallic microparticles with a linearly polarized Gaussian beam
论文作者
论文摘要
金属微粒的光学诱捕仍然是一个巨大的挑战，因为颗粒被强烈的散射和光吸收。在本文中，我们报告了一种新的机制，可以使用紧密焦点的线性极化高斯斑点来稳定地捕获金属微粒。我们从理论上和实验上证明了金属微粒被这种陷阱限制在光轴上。同时，横向旋转运动是由于陷阱作用在粒子上的不对称力场而发生的。金属微粒的离轴捕获和横向旋转为操纵金属微粒提供了新的方式。本文报告的作品对于更好地理解光和金属颗粒之间的机械相互作用也很重要。
Optical trapping of metallic microparticles remains a big challenge because of the strong scattering and absorption of light by the particles. In the paper, we report a new mechanism for stable trapping of metallic microparticles by using a tightly focused linearly polarized Gaussian spot. We theoretically and experimentally demonstrated that metallic microparticles were confined off the optical axis by such a trap. In the meanwhile, transverse spinning motion occurred as a consequence of the asymmetric force field acting on the particle by the trap. The off-axis trapping and transverse spinning of metallic microparticles provide new manners for the manipulation of metallic microparticles. The works reported in this paper are also of significance for a better understanding of the mechanical interaction between light and metallic particles.
