Laser trapping and necklace-like assembly formation of polystyrene microparticles at solution surface

摘要

Upon an irradiation of a tightly focused laser beam, micro and nanoparticles diffusing in solution are optically trapped at the focal spot three-dimensionally. We have been studying intensively on the laser trapping at an interface, such as glass/solution and air/solution interfaces, where optical potential expands from the focus to outside of focal spot up to few tens micrometer through light propagation and scattering of the trapping laser.