FDTD approach to optical forces of tightly focused vector beams on metal particles.
We propose an improved FDTD method to calculate the optical forces of tightly focused beams on microscopic metal particles. Comparison study on different kinds of tightly focused beams indicates that trapping efficiency can be altered by adjusting the polarization of the incident field. The results also show the size-dependence of trapping forces exerted on metal particles. Transverse tapping forces produced by different illumination wavelengths are also evaluated. The numeric simulation demonstrates the possibility of trapping moderate-sized metal particles whose radii are comparable to wavelength.
Nanjing National Laboratory of Microstructures, Department of Physics, Nanjing University, Nanjing 210093, China.
Jian-Qi
JQ
Qin
Xi-Lin
XL
Wang
Ding
D
Jia
Jing
J
Chen
Ya-Xian
YX
Fan
Jianping
J
Ding
Hui-Tian
HT
Wang