Fundamental study on micro-scaled additive manufacturing using optical potential induced by optical radiation pressure by Bessel beam

Abstract

Manufacturing technology for three-dimensional nano/micro-structures has been desired. In this study, we newly proposed the laser additive manufacturing method in vapor phase, by utilizing optical trapping potential to confine particles in a range smaller than diffraction limit of laser beam. In this paper, we have developed the optical trapping system with Bessel beam in order to investigate feasibility of the proposed fabrication methods. The water droplet of several µm in diameter containing particles suspended in space were successfully trapped in the optical potential of Bessel beam and then the only particles were deposited on the substrate. As a result of processing experiment, the silica particles with a diameter of 1 µm could be three dimensionally structured on the axis of the Bessel beam.