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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 16 — Aug. 7, 2006
  • pp: 7436–7446

Interference from multiple trapped colloids in an optical vortex beam

W. M. Lee, V. Garcés-Chävez, and K. Dholakia  »View Author Affiliations

Optics Express, Vol. 14, Issue 16, pp. 7436-7446 (2006)

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Laguerre-Gaussian (LG) beams are important in optical micromanipulation. We show that optically trapped microparticles within a monochromatic LG beam may lead to the formation of unique intensity patterns in the far field due to multiple interference of the forward scattered light from each particle. Trapped colloids create far field interference that exhibits distinct spiral wave patterns that are directly correlated to the helicity of the LG beam. Using two trapped particles, we demonstrate the first microscopic version of a Young’s slits type experiment and detect the azimuthal phase variation around the LG beam circumference. This novel technique may be implemented to study the relative phase and spatial coherence of two points in trapping light fields with arbitrary wavefronts.

© 2006 Optical Society of America

OCIS Codes
(020.7010) Atomic and molecular physics : Laser trapping
(050.5080) Diffraction and gratings : Phase shift
(260.3160) Physical optics : Interference

ToC Category:

Original Manuscript: June 13, 2006
Revised Manuscript: July 24, 2006
Manuscript Accepted: July 24, 2006
Published: August 7, 2006

Virtual Issues
Vol. 1, Iss. 9 Virtual Journal for Biomedical Optics

W. M. Lee, V. Garcés-Chávez, and K. Dholakia, "Interference from multiple trapped colloids in an optical vortex beam," Opt. Express 14, 7436-7446 (2006)

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