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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 1, Iss. 5 — May. 5, 2006

Visualization of optical binding of microparticles using a femtosecond fiber optical trap

N. K. Metzger, E. M. Wright, W. Sibbett, and K. Dholakia  »View Author Affiliations

Optics Express, Vol. 14, Issue 8, pp. 3677-3687 (2006)

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At the microscopic level, light-matter interactions can organize colloidal matter via a process known as optical binding. Optical binding refers to the creation of arrays of microparticles formed in the presence of laser fields, the inter-particle spacing being determined by the refocusing and/or scattering of the laser fields by the microparticles. In this paper we investigate one-dimensional optically bound arrays of microparticles using a femtosecond dual-beam optical fiber trap, and develop a means to visualize the field intensity distributions responsible for the optical binding using two-photon fluoresence imaging from fluorescein added to the host medium. The experimental intensity distributions are shown to be in good agreement with numerical simulations, thereby validating our new approach to visualizing the fields responsible for optical binding, and the physical model of optical binding as due to refocusing of the fields by the microparticles.

© 2006 Optical Society of America

OCIS Codes
(060.2310) Fiber optics and optical communications : Fiber optics
(140.7010) Lasers and laser optics : Laser trapping
(190.4180) Nonlinear optics : Multiphoton processes

ToC Category:

Original Manuscript: February 14, 2006
Revised Manuscript: April 1, 2006
Manuscript Accepted: April 2, 2006
Published: April 17, 2006

Virtual Issues
Vol. 1, Iss. 5 Virtual Journal for Biomedical Optics

N. K. Metzger, E. M. Wright, W. Sibbett, and K. Dholakia, "Visualization of optical binding of microparticles using a femtosecond fiber optical trap," Opt. Express 14, 3677-3687 (2006)

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