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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 19 — Sep. 10, 2012
  • pp: 21119–21125

Optical trapping using cascade conical refraction of light

D. P. O’Dwyer, K. E. Ballantine, C. F. Phelan, J. G. Lunney, and J. F. Donegan  »View Author Affiliations

Optics Express, Vol. 20, Issue 19, pp. 21119-21125 (2012)

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Cascade conical refraction occurs when a beam of light travels through two or more biaxial crystals arranged in series. The output beam can be altered by varying the relative azimuthal orientation of the two biaxial crystals. For two identical crystals, in general the output beam comprises a ring beam with a spot at its centre. The relative intensities of the spot and ring can be controlled by varying the azimuthal angle between the refracted cones formed in each crystal. We have used this beam arrangement to trap one microsphere within the central spot and a second microsphere on the ring. Using linearly polarized light, we can rotate the microsphere on the ring with respect to the central sphere. Finally, using a half wave-plate between the two crystals, we can create a unique beam profile that has two intensity peaks on the ring, and thereby trap two microspheres on diametrically opposite points on the ring and rotate them around the central sphere. Such a versatile optical trap should find application in optical trapping setups.

© 2012 OSA

OCIS Codes
(050.1940) Diffraction and gratings : Diffraction
(140.7010) Lasers and laser optics : Laser trapping
(260.1440) Physical optics : Birefringence

ToC Category:
Optical Trapping and Manipulation

Original Manuscript: July 19, 2012
Revised Manuscript: August 20, 2012
Manuscript Accepted: August 20, 2012
Published: August 30, 2012

Virtual Issues
Vol. 7, Iss. 11 Virtual Journal for Biomedical Optics

D. P. O’Dwyer, K. E. Ballantine, C. F. Phelan, J. G. Lunney, and J. F. Donegan, "Optical trapping using cascade conical refraction of light," Opt. Express 20, 21119-21125 (2012)

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