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Cluster formation in ferrofluids induced by holographic optical tweezers

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Abstract

Holographic optical tweezers were used to show the interaction between a strongly focused laser beam and magnetic nanoparticles in ferrofluid. When the light intensity was high enough, magnetic nanoparticles were removed from the beam center and formed a dark ring. The same behavior was observed when focusing vortex or Bessel beams. The interactions between two or more separated rings of magnetic nanoparticles created by independent optical traps were also observed.

© 2013 Optical Society of America

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Supplementary Material (5)

Media 1: MP4 (559 KB)     
Media 2: MP4 (769 KB)     
Media 3: AVI (1306 KB)     
Media 4: MP4 (1268 KB)     
Media 5: AVI (3912 KB)     

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