Abstract
We studied the unconventional laser trapping of nanoparticles using strong optical nonlinearity. If the
laser frequency is resonant with the electronic transition of particles, the optical force is enhanced, and
optical nonlinearity easily appears. This article discusses the influence of strong optical nonlinearity on
the exerted optical force. Further, as a possible effect arising from nonlinearity, super-resolution trapping
by optical vortex is theoretically demonstrated.
