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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 17 — Aug. 16, 2010
  • pp: 18217–18222

Dynamic axial stabilization of counter-propagating beam-traps with feedback control

Sandeep Tauro, Andrew Bañas, Darwin Palima, and Jesper Glückstad  »View Author Affiliations

Optics Express, Vol. 18, Issue 17, pp. 18217-18222 (2010)

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Optical trapping in a counter-propagating (CP) beam-geometry provides unique advantages in terms of working distance, aberration requirements and intensity hotspots. However, its axial performance is governed by the wave propagation of the opposing beams, which can limit the practical geometries. Here we propose a dynamic method for controlling axial forces to overcome this constraint. The technique uses computer-vision object tracking of the axial position, in conjunction with software-based feedback, for dynamically stabilizing the axial forces. We present proof-of-concept experiments showing real-time rapid repositioning coupled with a strongly enhanced axial trapping for a plurality of particles of varying sizes. We also demonstrate the technique’s adaptability for real-time reconfigurable feedback-trapping of a dynamically growing structure that mimics a continuously dividing cell colony. Advanced implementation of this feedback-driven approach can help make CP-trapping resistant to a host of perturbations such as laser fluctuations, mechanical vibrations and other distortions emphasizing its experimental versatility.

© 2010 OSA

OCIS Codes
(100.0100) Image processing : Image processing
(350.4855) Other areas of optics : Optical tweezers or optical manipulation
(070.6120) Fourier optics and signal processing : Spatial light modulators

ToC Category:
Optical Trapping and Manipulation

Original Manuscript: July 1, 2010
Revised Manuscript: August 1, 2010
Manuscript Accepted: August 2, 2010
Published: August 9, 2010

Virtual Issues
Vol. 5, Iss. 13 Virtual Journal for Biomedical Optics

Sandeep Tauro, Andrew Bañas, Darwin Palima, and Jesper Glückstad, "Dynamic axial stabilization of counter-propagating beam-traps with feedback control," Opt. Express 18, 18217-18222 (2010)

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