Photothermal dynamics of micro-glass beads coated with gold nanoparticles in water: Fine bubble generation and fluid-induced laser trapping

摘要

In this study, gold nanoparticles were heterogeneously deposited onto the surfaces of glass beads through a gold ion reduction method to obtain "plasmonic beads". Plasmonic beads in pure water were illuminated with a visible continuous-wave laser through an objective lens. Using a relatively low-power laser, plasmonic beads were optically trapped and aggregated the other beads over an area much greater than the focal point. On the other hand, using a high-power laser (20 mW/mu m(2)), microbubbles were produced in water. Thus, the plasmonic beads studied herein can act as optically controllable fluid and microbubble generators. (C) 2018 The Japan Society of Applied Physics