Strong tangential force within a small trapping volume under near-field Laguerre-Gaussian beam illumination.
Near-field rotation of a trapped particle under focused evanescent Laguerre-Gaussian beam illumination is theoretically investigated by mapping the two-dimensional transverse trapping efficiency exerting on the particle. It is revealed that the severe focal field deformation associated with a focused evanescent Laguerre-Gaussian beam causes a significant impact on the transverse trapping performance of the microparticle. Compared with the far-field trapping force, strong tangential force components have been observed in the transverse efficiency mapping, which potentially lead to rotational motions to the particle within a small trapping volume in the optical near-field.
Jia
Baohua
B
Faculty of Engineering and Industrial Sciences, Center for Micro-Photonics, Swinburne University of Technology, Hawthorn 3122, Australia. bjia@swin.edu.au
Gan
Xiaosong
X
Gu
Min
M
D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008029:Lighting / Q000295:instrumentation* / Q000379:methods; D015233:Models, Statistical; D016011:Normal Distribution; D052898:Optical Tweezers; D012031:Refractometry / Q000295:instrumentation*