title: Photophoretic assembly and migration of dielectric particles and Escherichia coli in liquids using a subwavelength diameter optical fiber.
abstract: We demonstrate a photophoretic assembly and migration of dielectric (SiO(2) and TiO(2)) particles and bacteria (Escherichia coli) in liquids by using a subwavelength diameter fiber. With a lightwave at 1.55 μm launched into the fiber, the objects are radiated by the leaking light of the fiber to yield negative photophoretic forces which drive the objects to move toward the fiber, with an average assembling/migrating speed of 5-15 individuals per second (ind/s). The influences of laser-on duration, optical power, and size of particles on the photophoretic velocities are also investigated.
authors.affiliation: State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou, 510275, China.
authors.forename: Hongxiang
authors.initials: H
authors.lastname: Lei
authors.forename: Yao
authors.initials: Y
authors.lastname: Zhang
authors.forename: Xingmin
authors.initials: X
authors.lastname: Li
authors.forename: Baojun
authors.initials: B
authors.lastname: Li
mesh_terms: D017097:Electric Impedance; D004926:Escherichia coli; D008027:Light; D009038:Motion; D055100:Optical Fibers; D012822:Silicon Dioxide / Q000737:chemistry; D014025:Titanium / Q000737:chemistry
chemical_list: C009495:titanium dioxide; D012822:Silicon Dioxide; D014025:Titanium