Optical sorting and detection of submicrometer objects in a motional standing wave
Optical sorting and detection of submicrometer objects in a motional standing wave
复制标题
DOI：
10.1103/physrevb.74.035105
复制
发表时间：
2006-07-01
影响因子：
3.7
通讯作者：
Dholakia, Kishan
中科院分区：
文献类型：
--
作者：
Cizmar, Tomas;Siler, Martin;Dholakia, Kishan
靠近表面的扩展干涉图案可能会产生透射或渐逝的表面场，用于大面积操纵捕获的粒子。不同粒径的颗粒与移动的驻波光图案的亲和力使我们能够以双向方式保持和传递它们，并通过实验证明亚微米区域的颗粒分选。这是在不需要流体流动的情况下执行的（静态分选）。理论预测支持实验观察结果，即某些尺寸的胶体颗粒更容易在相邻陷阱之间热跳跃。还提出了一种用于扩展周期光模式中粒子位置检测的通用方法，并应用于光陷阱和粒子行为的表征。
An extended interference pattern close to the surface may result in either a transmissive or an evanescent surface field for large-area manipulation of trapped particles. The affinity of differing particle sizes to a moving standing-wave light pattern allows us to hold and deliver them in a bidirectional manner and demonstrate experimentally particle sorting in the submicrometer region. This is performed without the need of fluid flow (static sorting). Theoretical predictions support the experimental observations that certain sizes of colloidal particles thermally hop more easily between neighboring traps. A generic method is also presented for particle position detection in an extended periodic light pattern and applied to characterization of optical traps and particle behavior.