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Proceedings Paper

Optical micromanipulation of microscopic particles using axicon tipped fiber
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Paper Abstract

Trapping and manipulation of microscopic objects using fiber optical traps is gaining considerable interest, as these objects can be manipulated inside complex environments, thus removing the limitation of short working distance of the conventional optical tweezers. We show that an axicon like structure built on the tip of a single mode optical fiber produces a focused beam shape with a central hole, implying a very small fraction of the power traveling with rays nearly parallels to the optical axis. Interesting transportation behavior of polystyrene particles using the scattering forces from such an axicon tip fiber was observed. As the distance of the particle from the fiber tip increased, since almost no rays interact with the particle, the scattering forces decreased substantially. Therefore, velocity of the particle at different distances was found to depend much more critically on the particle size in contrast to the beam generated by the bare fiber. While the speed of transport could be increased linearly by increasing the laser power in both axicon tipped fiber and bare fiber, increased speed was observed for particles of larger sizes for both the fiber types. However, the fractional increase in speed for increased size of particles was found to be quite large for axicon tipped fiber as compared to the bare fiber. Use of the observed differences in speed of transportation of microscopic objects could be used to sort them based upon their size.

Paper Details

Date Published: 28 February 2006
PDF: 10 pages
Proc. SPIE 6095, Nanobiophotonics and Biomedical Applications III, 60950F (28 February 2006); doi: 10.1117/12.647277
Show Author Affiliations
Carlo Liberale, Univ. degli Studi di Pavia (Italy)
Samarendra Kumar Mohanty, Ctr. for Advanced Technology (India)
Khyati Samarendra Mohanty, Maharaja Sayajirao Univ. of Baroda (India)
Ctr. for Advanced Technology (India)
Vittorio Degiorgio, Univ. degli Studi di Pavia (Italy)
Stefano Cabrini, TASC INFM-CNR (Italy)
Alessandro Carpentiero, TASC INFM-CNR (Italy)
Enrico Ferrari, TASC INFM-CNR (Italy)
Univ. of Trieste (Italy)
Dan Cojoc, TASC INFM-CNR (Italy)
Enzo Di Fabrizio, Univ. Magna Græcia, Germaneto (Italy)


Published in SPIE Proceedings Vol. 6095:
Nanobiophotonics and Biomedical Applications III
Alexander N. Cartwright; Dan V. Nicolau, Editor(s)

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