Open AccessFDTD approach to optical forces of tightly focused vector beams on metal particles
Author(s) -
Jianqi Qin,
Xiaohao Wang,
Jia Di,
Jing Chen,
Ya-Xian Fan,
Jianping Ding,
HuiTian Wang
Publication year - 2009
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.17.008407
Subject(s) - optical force , optical tweezers , trapping , optics , finite difference time domain method , polarization (electrochemistry) , wavelength , materials science , metal , light beam , transverse plane , physics , chemistry , ecology , structural engineering , metallurgy , biology , engineering
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.