Effect of spatial coherence on radiation forces acting on a Rayleigh dielectric sphere.
We show that the radiation forces (RFs) on a Rayleigh dielectric sphere induced by a partially coherent light beam are greatly affected by the spatial coherence. We find that the magnitude of the RFs greatly decreases as the spatial coherence decreases and derive an inequality for the required correlation width sigma(0) (i.e., the spatial coherence of the beam) to stably trap the particles.
Wang
Li-Gang
LG
Department of Physics, Zhejiang University, Hangzhou, China. sxwlg@yahoo.com.cn
Zhao
Cheng-Liang
CL
Wang
Li-Qin
LQ
Lu
Xuan-Hui
XH
Zhu
Shi-Yao
SY