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.

[1]  Mark G. Raizen,et al.  Millikelvin cooling of an optically trapped microsphere in vacuum , 2011, 1101.1283.

[2]  Peng Zhang,et al.  Observation of trapping and transporting air-borne absorbing particles with a single optical beam , 2012 .

[3]  Arthur Ashkin,et al.  Optical Levitation by Radiation Pressure , 1971 .

[4]  David McGloin,et al.  Optical manipulation of airborne particles: techniques and applications. , 2008, Faraday discussions.

[5]  A. Suzuki,et al.  Observation of a single-beam gradient-force optical trap for dielectric particles in air. , 1997, Optics letters.

[6]  Wieslaw Krolikowski,et al.  Optical guiding of absorbing nanoclusters in air. , 2009, Optics express.

[7]  W. Krolikowski,et al.  Robust trapping and manipulation of airborne particles with a bottle beam , 2011, 2011 International Quantum Electronics Conference (IQEC) and Conference on Lasers and Electro-Optics (CLEO) Pacific Rim incorporating the Australasian Conference on Optics, Lasers and Spectroscopy and the Australian Conference on Optical Fibre Technology.

[8]  N. Takegawa,et al.  Directional dependence of thermal emission from nonspherical carbon particles , 2009 .

[9]  Oliver Krauss,et al.  Experiments on negative photophoresis and application to the atmosphere , 2008 .

[10]  Yong-qing Li,et al.  Measurement of Raman spectra of single airborne absorbing particles trapped by a single laser beam. , 2013, Optics letters.

[11]  Wieslaw Krolikowski,et al.  Photophoretic manipulation of absorbing aerosol particles with vortex beams: theory versus experiment. , 2009, Optics express.

[12]  Olga Jovanovic,et al.  Photophoresis—Light induced motion of particles suspended in gas , 2009 .

[13]  Peng Zhang,et al.  Trapping and transporting aerosols with a single optical bottle beam generated by moiré techniques. , 2011, Optics letters.

[14]  Wieslaw Krolikowski,et al.  Giant optical manipulation. , 2010, Physical review letters.

[15]  Yong-Le Pan,et al.  Photophoretic trapping of absorbing particles in air and measurement of their single-particle Raman spectra. , 2012, Optics express.

[16]  A. Ashkin.  Acceleration and trapping of particles by radiation pressure , 1970 .

[17]  H. Rohatschek,et al.  Semi-empirical model of photophoretic forces for the entire range of pressures , 1995 .

[18]  A. Tielens,et al.  Laboratory Experiments on Rotation and Alignment of the Analogs of Interstellar Dust Grains by Radiation , 2004 .

[19]  Cornelia Denz,et al.  Photophoretic trampoline—Interaction of single airborne absorbing droplets with light , 2012, 1209.4464.

[20]  C. Alpmann,et al.  Holographic optical bottle beams , 2011, 1112.5270.