Rotation controlling of spiraling elliptic beams in inhomogeneous nonlocal media

The dynamics of spiraling elliptic beams in longitudinally-inhomogeneous nonlocal media with z-varied characteristic length (CL) were discussed. When the response CL of nonlocal nonlinear media gradually varies, the spiraling elliptic beams at the critical powers can evolve as rotating solitons with CL-dependent rotating velocity. This kind of dynamical evolution for spiraling elliptic beam is confirmed to exist in the actual nonlinear media, the nematic liquid crystals, when the CL varies with z. We also investigate the gradient force exerted by an elliptic beam upon micro-particles from the application point of view in optical tweezers, and find that the gradient force also can be conveniently controlled by the varied CL.