论文标题
从两个光学悬浮的纳米颗粒中的散射矢量光场干扰
Interference of the scattered vector light fields from two optically levitated nanoparticles
论文作者
论文摘要
我们通过实验研究了真空中两个光学上悬浮的纳米颗粒的偶极子散射光的干扰，该光线呈现出一个不含粒子底物相互作用的环境。我们用线性极化的探针梁正交以捕获激光束的传播来照亮两个被困的纳米颗粒。来自纳米颗粒的散射光通过高数值孔径（Na）物镜收集并成像。观察到来自图像和傅立叶空间中不同偶极子方向的散射矢量光的干扰条纹。尤其是，具有极化涡流的两个散射光场的干扰条纹显示出图像空间中两个纳米颗粒的内部和中心区域之间的干扰条纹的π移。据我们所知，这是对自由空间中两个偶极子的散射矢量光场干扰的第一个实验性观察。这项工作还提供了一种简单而直接的方法，可以通过干扰条纹确定光悬浮的纳米颗粒之间的空间尺度。
We experimentally study the interference of dipole scattered light from two optically levitated nanoparticles in vacuum, which present an environment free of particle-substrate interactions. We illuminate the two trapped nanoparticles with a linearly polarized probe beam orthogonal to the propagation of the trapping laser beams. The scattered light from the nanoparticles are collected by a high numerical aperture (NA) objective lens and imaged. The interference fringes from the scattered vector light for the different dipole orientations in image and Fourier space are observed. Especially, the interference fringes of two scattered light fields with polarization vortex show the π shift of the interference fringes between inside and outside the center region of the two nanoparticles in the image space. As far as we know, this is the first experimental observation of the interference of scattered vector light fields from two dipoles in free space. This work also provides a simple and direct method to determine the spatial scales between optically levitated nanoparticles by the interference fringes.
