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광압을 이용한 입자빔 집속
Particle Beam Focusing Using Radiation Pressure

김상복   (한국과학기술원 기계공학과UU0001375  ); 박형호   (한국과학기술원 기계공학과UU0001375  ); 김상수   (한국과학기술원 기계공학과UU0001375  );
  • 초록

    A novel technique for fine particle beam focusing under the atmospheric pressure is introduced using a radiation pressure assisted aerodynamic lens. To introduce the radiation pressure in the aerodynamic focusing system, a 25m plano-convex lens having 2.5mm hole at its center is used as an orifice. The particle beam width is measured for various laser power, particle size, and flow velocity. In addition, the effect of the laser characteristics on the beam focusing is evaluated comparing an optical tweezers type and pure gradient force type. For the pure aerodynamic focusing system, the particle beam width was decreased as increasing particle size and Reynolds number. Using the optical tweezers type, the particle beam width becomes smaller than that of the pure aerodynamic focusing system about $16\%,\;11.4\%\;and\;9.6\%$ for PSL particle size of $2.5{\mu}m,\;1.0{\mu}m,\;and\;0.5{\mu}m$ , respectively. Particle beam width was minimized around the laser power of 0.2W. However, as increasing the laser power higher than 0.4W, the particle beam width was increased a little and it approached almost a constant value which is still smaller than that of the pure aerodynamic focusing system. For pure gradient force type, the reduction of the particle beam width was smaller than optical tweezers type but proportional to laser power. The radiation pressure effect on the particle beam width is intensified as Reynolds number decreases or particle size increases relatively.


  • 주제어

    입자빔 .   공기역학 렌즈 .   광압.  

  • 참고문헌 (9)

    1. Liu, P., Ziemann, P. J., Kittelson, D. B. and McMurry, P. H., 1995, 'Generating Particle Beams of Controlled Dimensions and Divergence: I. Theory of Particle Motion in Aerodynamic Lenses and Nozzle Expansions,' Aerosol Sci. Tech., Vol. 22, pp. 293-313 
    2. Liu, P., Ziemann, P. J., Kittelson, D. B. and McMurry, P. H., 1995, 'Generating Particle Beams of Controlled Dimensions and Divergence: II. Experimental Evaluation of Particle Motion in Aerodynamic Lenses and Nozzle Expansions,' Aerosol Sci. Tech., Vol. 22, pp. 314-324 
    3. Ashkin, A., 1970, 'Acceleration and Trapping of Particles by Radiation Pressure,' Phys. Rev. Lett., Vol. 26, pp. 156-159 
    4. Ashkin, A., Dziedizic, J. M. and Chu, S., 1986, 'Observation of a Aingle-beam Gradient Force Optical Trap for Dielectric Particles,' Opt. Lett., Vol. 11, pp. 288-290 
    5. Ashkin, A. and Dziedzic, J. M., 1987, 'Optical Trapping and Manipulation of Viruses and Bacteria,' Science, Vol. 235,pp. 1517-1520 
    6. Steubing, R., Cheng, S., Wright, W. R., Numajiri, Y. and Berns, M. W., 1991, 'Laser Induced Cell Fusion in Combination with Optical Tweezers: the Laser-Cell Fusion Trap,' Cytometry, Vol. 12, pp. 505-510 
    7. Misawa, H., Koshioka, M., Sasaki, K., Kitamura, N. and Masuhara, H., 1991, 'Three Dimensional Optical Trapping and Llaser Ablation of a Single Polymer Latex Particle in Water,' J. Appl. Phys, Vol. 70, pp. 3829-3836 
    8. Takashi, K., Yasunori, I., Naokiee, M. and Totaro, I., 1997, 'Theory of Optical Chromatography,' Anal. Chem., Vol. 69, pp. 2701-2710 
    9. Lee, M., Yi, M. and Lee, S., 2003, 'Inertia Focusing of Particles with an Aerodynamic Lens in the Atmospheric Pressure Range,' J. Aerosol Sci., Vol. 34, pp.211-224 

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