Photophoresis-based laser manipulation of airborne particles using structured laser beams

摘要

We investigate laser trapping of airborne light-absorbing particles via photophoretic forces. It is well known that the use of photophoretic forces allows one to guide light-absorbing nano- and microparticles at distances of up to tens of centimeters. We use various types of structured laser beams (optical "bottle" beams and line-shaped optical traps) for manipulation of agglomerations of carbon nanoparticles. The possibility to trap and guide both single light-absorbing particles and arrays of light-absorbing particles is demonstrated. In addition, the possibility of power-dependent particle guiding is shown.