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Title: Optical trapping and rotation of airborne absorbing particles with a single focused laser beam

We measure the periodic circular motion of single absorbing aerosol particles that are optically trapped with a single focused Gaussian beam and rotate around the laser propagation direction. The scattered light from the trapped particle is observed to be directional and change periodically at 0.4–20 kHz. The instantaneous positions of the moving particle within a rotation period are measured by a high-speed imaging technique using a charge coupled device camera and a repetitively pulsed light-emitting diode illumination. The centripetal acceleration of the trapped particle as high as ∼20 times the gravitational acceleration is observed and is attributed to the photophoretic forces.
Authors:
;  [1]
  1. Department of Physics, East Carolina University, Greenville, North Carolina 27858-4353 (United States)
Publication Date:
OSTI Identifier:
22257211
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AEROSOLS; CHARGE-COUPLED DEVICES; LASERS; LIGHT EMITTING DIODES; PARTICLES; PERIODICITY; TRAPPING; VISIBLE RADIATION