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Please use this identifier to cite or link to this item: http://hdl.handle.net/2262/49406

Title: Conical diffraction of linearly polarised light controls the angular position of a microscopic object
Author: BALLANTINE, KYLE EDWARD
PHELAN, CIARAN
RAKOVICH, YURY
DONEGAN, JOHN FRANCIS
LUNNEY, JAMES GERARD
Sponsor: Science Foundation Ireland
Author's Homepage: http://people.tcd.ie/jlunney
http://people.tcd.ie/rakovicy
http://people.tcd.ie/jdonegan
Keywords: Optics
Diffraction
Issue Date: 2010
Citation: D. O'Dwyer, C. F. Phelan, K. E. Ballantine, Y. Rakovich, J. G. Lunney and J. F. Donegan, Conical diffraction of linearly polarised light controls the angular position of a microscopic object, Optics Express, 18, 26, 2010, 27319 27326
Series/Report no.: Optics Express
18
26
Abstract: Conical diffraction of linearly polarised light in a biaxial crystal produces a beam with a crescent-shaped intensity profile. Rotation of the plane of polarisation produces the unique effect of spatially moving the crescent-shaped beam around a ring. We use this effect to trap microspheres and white blood cells and to position them at any angular position on the ring. Continuous motion around the circle is also demonstrated. This crescent beam does not require an interferometeric arrangement to form it, nor does it carry optical angular momentum. The ability to spatially locate a beam and an associated trapped object simply by varying the polarisation of light suggests that this optical process should find application in the manipulation and actuation of micro- and nano-scale physical and biological objects. ©2010 Optical Society
Description: PUBLISHED
URI: http://hdl.handle.net/2262/49406
Related links: http://dx.doi.org/10.1364/OE.18.027319
Appears in Collections:Physics (Scholarly Publications)

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