Institute of Advanced Photonics, School of Physics, Harbin Institute of Technology, Harbin 150001, China.
School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology, Dalian 116024, China.
Phys Rev Lett. 2020 Apr 10;124(14):143901. doi: 10.1103/PhysRevLett.124.143901.
We report an ingenious mechanism to obtain robust optical pulling force by a single plane wave via engineering the topology of light momentum in the background. The underlying physics is found to be the topological transition of the light momentum from a usual convex shape to a starlike concave shape in the carefully designed background, such as a photonic crystal structure. The principle and results reported here shed insightful concepts concerning optical pulling, and pave the way for a new class of advanced optical manipulation technique, with potential applications of drug delivery and cell sorting.
我们报告了一种通过工程化背景中的光动量拓扑结构来利用单个平面波获得稳健光学拉力的巧妙机制。研究发现，在精心设计的背景（如光子晶体结构）中，光动量从通常的凸形拓扑转变为星形凹形拓扑，这是产生光学拉力的基础物理机制。这里报道的原理和结果为光学拉力提供了有见地的概念，并为一类新的先进光学操控技术铺平了道路，在药物输送和细胞分选等方面具有潜在的应用。
