Simultaneous trapping of low- and high-index microparticles by using highly focused elegant Hermite-cosh-Gaussian beams

The analytical expression for the propagation of elegant Hermite-cosh-Gaussian (EHCHG) beams through a paraxial ABCD optical system is derived and used to study the radiation forces produced by highly focused EHCHG beams acting on a Rayleigh dielectric particle. Owing to the characteristics of this kind of beams our analysis shows that it can be expected to simultaneously trap and manipulate dielectric spheres with low-refractive index at the focal point, and particles with high-refractive index nearby the focal point. Finally, the stability conditions for effective trapping and manipulating particles by this kind of focused beams are discussed.

► We derive the analytical propagation expression of elegant Hermite-cosh-Gaussian (EHCHG) beams. ► We study the radiation forces produced by highly focused EHCHG beams acting on a particle. ► It can simultaneously trap and manipulate dielectric spheres with low and high refractive index. ► We discuss the stability conditions for effective trapping and manipulating particles.