METHOD AND OPTICAL DEVICE FOR TRAPPING A PARTICLE

摘要

It is disclosed an optical device for trapping a particle immersed in a fluid. The device of the invention comprises a light source and a probe for guiding and outputting the radiation received from the source. According to the invention, the guided radiation has an intensity distribution having intensity maximum placed at a non-zero distance from the probe longitudinal axis and having rotational symmetry about the longitudinal axis. Further, according to the invention, the intensity maximum is reflected at the interface between probe and fluid, and then it is output by the probe so that it creates a stable equilibrium point wherein the particle is trapped.