title: Flow-assisted single-beam optothermal manipulation of microparticles.
abstract: An optothermal tweezer was developed with a single-beam laser at 1550 nm for manipulation of colloidal microparticles. Strong absorption in water can thermally induce a localized flow, which exerts a Stokes' drag on the particles that complements the gradient force. Long-range capturing of 6 microm polystyrene particles over approximately 176 microm was observed with a tweezing power of approximately 7 mW. Transportation and levitation, targeted deposition and selective levitation of particles were explored to experimentally demonstrate the versatility of the optothermal tweezer as a multipurpose particle manipulation tool.
authors: Photonic Device Laboratory, Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
authors: Yangyang
authors: Y
authors: Liu
authors: Andrew W
authors: AW
authors: Poon
mesh_terms: D003102:Colloids; D004867:Equipment Design; D046210:Microfluidic Analytical Techniques / Q000295:instrumentation*; D008846:Micromanipulation / Q000295:instrumentation*; D052898:Optical Tweezers; D010316:Particle Size; D011137:Polystyrenes; D013696:Temperature; D014867:Water
chemical_list: D003102:Colloids; D011137:Polystyrenes; D014867:Water