Department of Physics, Harbin Institute of Technology, Harbin 150001, China.
Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117583, Singapore.
Phys Rev Lett. 2018 Mar 23;120(12):123901. doi: 10.1103/PhysRevLett.120.123901.
We achieve long-range and continuous optical pulling in a periodic photonic crystal background, which supports a unique Bloch mode with the self-collimation effect. Most interestingly, the pulling force reported here is mainly contributed by the intensity gradient force originating from the self-induced backaction of the object to the self-collimation mode. This force is sharply distinguished from the widely held conception of optical tractor beams based on the scattering force. Also, this pulling force is insensitive to the angle of incidence and can pull multiple objects simultaneously.
我们在周期性光子晶体背景中实现了远程连续光牵引，该背景支持具有自准直效应的独特 Bloch 模式。最有趣的是，这里报道的牵引力主要来源于源自物体对自准直模式的自感应反作用的强度梯度力。这种力与基于散射力的普遍光学牵引光束概念明显不同。此外，这种牵引力对入射角不敏感，并且可以同时牵引多个物体。
