论文标题
实现涡流对及其在光学镊子中的应用
Realization of vortex pair and its application in optical tweezers
论文作者
论文摘要
作为光的一个基本特性，光子的轨道角动量（OAM）引起了广泛的兴趣。在这里，我们从理论上证明，当线变量局部线性极化（LVLLP）束被高数值孔径（Na）物镜强烈聚焦时，无自旋状态的光转化可能会发生在同质和各向同性培养基中。此处的高NA物镜充当调节器，可实现输入SDLLP梁的左右圆形振动的两个组件的旋转oAM转换。因此，发生从线性状态到共轭OAM状态的部分转化，导致螺旋相对于两个焦点的纵向分量，其方向相反。此外，这种定制的光场可用于识别和分离光学镊子中的手性对象。
As one fundamental property of light, the orbital angular momentum (OAM) of photon has elicited widespread interest. Here, we theoretically demonstrate that the OAM conversion of light without spin state can occur in homogeneous and isotropic medium when a line-variant locally linearly polarized (LVLLP) beam is strongly focused by a high numerical aperture (NA) objective lens. The high-NA objective lens here acts as a modulator that enables the spin-to-orbital OAM conversion of the two components of left and right circular vibrations of the input SDLLP beam spatially separated. Hence, partial conversion from linear state to conjugate OAM states takes place, resulting in helical phases with opposite directions for the longitudinal component of the two foci. Furthermore, such customized light field can be used to identify and separate chiral objects in optical tweezers.
