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18 October 2004 Normal-light streak effect in optically trapped hollow microspheres
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We report on the observation of a normal streak effect on hollow micron sized spheres when illuminated by a focused Gaussian beam in a conventional optical tweezers setup. The hollow microspheres suspended in water can be optically trapped at the center of the illuminating beam. When the microsphere is illuminated off center, an emerging beam approximately perpendicular respect to the incoming beam is generated. This effect due to total internal reflections has been observed in microspheres with different external diameters, ranging from 5-20 microns. The generated normal beam is used to either pull or push other particles or objects around the microsphere or to remove particles stuck to the sphere due to radiation pressure.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ibis Ricardez-Vargas, David Iturbe-Castillo, Ruben Ramos-Garcia, Karen P. Volke-Sepulveda, and Victor Ruiz-Cortes "Normal-light streak effect in optically trapped hollow microspheres", Proc. SPIE 5514, Optical Trapping and Optical Micromanipulation, (18 October 2004);


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