We propose an enantioselective scheme to sort homogeneous chiral particles using optical tweezers. For a certain range of material parameters, we show that a highly focused circularly polarized laser beam traps particles of a specific chirality selected by the handedness of the trapping beam. Furthermore, by applying a transverse Stokes drag force that displaces the trapped particle off-axis, we allow for the rotation of the particle center-of-mass around the trapping beam axis. The rotation angle is highly dependent on the handedness of the trapped particle and is easily measurable with standard video-microscopy techniques, allowing for an alternative mechanism for chiral resolution. Our platform not only allows for enantio selection of particles dispersed in solution but also paves the way to characterization of the chiral parameter of individual, homogeneous chiral microspheres using optical tweezing.

中文翻译：

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用光镊探测单个纳米粒子的光学手性响应

我们提出了一种对映选择性方案，使用光学镊子对均质手性颗粒进行分类。对于一定范围的材料参数，我们显示出高度聚焦的圆偏振激光束会捕获具有特定手性的粒子，该粒子由捕获束的旋向性选择。此外，通过施加横向Stokes拖曳力使捕获的粒子偏离轴方向，我们可以使粒子质量中心围绕捕获束轴旋转。旋转角度高度取决于所捕获粒子的手性，并且可以使用标准的视频显微镜技术轻松测量，从而为手性拆分提供了另一种机制。