Abstract
The optical trapping characteristics of highly focused higher-order radially polarized beams (R-TEMp1*) acting on a Rayleigh particle are studied theoretically. Numerical results show that as the order p of beam increases and the numerical aperture NAo of the objective decreases, the axial trap distance increases but the trap depth and maximum restoring force decreases. In a limit of NAo=1, three higher-order R-TEMp1* beams of p=1, 2, 3, like the fundamental lowest-order radially polarized beam of p=0, can three-dimensionally trap a particle to the focus but the axial trap stiffness decreases with the increase of p. When NAo=0.95, the focus is still a stable trap point for the two beams of p=0 and 1 but it becomes an unstable trap point for the two beams of p=2 and 3. The trap stability is also discussed for higher-order radially polarized beam illumination.
Published Version
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