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Optics Letters

Optics Letters


  • Vol. 36, Iss. 20 — Oct. 15, 2011
  • pp: 4056–4058

Role of condenser iris in optical tweezer detection system

Akbar Samadi and S. Nader S. Reihani  »View Author Affiliations

Optics Letters, Vol. 36, Issue 20, pp. 4056-4058 (2011)

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Optical tweezers have proven to be very useful in various scientific fields, from biology to nanotechnology. In this Letter we show, both by theory and experiment, that the interference intensity pattern at the back focal plane of the condenser consists of two distinguishable areas with anticorrelated intensity changes when the bead is moved in the axial direction. We show that the space angle defining the border of two areas linearly depends on the NA of the objective. We also propose a new octant photodiode, which could significantly improve the axial resolution compared to the commonly used quadrant photodiode technique.

© 2011 Optical Society of America

OCIS Codes
(140.7010) Lasers and laser optics : Laser trapping
(170.4520) Medical optics and biotechnology : Optical confinement and manipulation
(350.4855) Other areas of optics : Optical tweezers or optical manipulation

ToC Category:
Optical Tweezers or Optical Manipulation

Original Manuscript: July 18, 2011
Revised Manuscript: September 18, 2011
Manuscript Accepted: September 20, 2011
Published: October 12, 2011

Virtual Issues
Vol. 6, Iss. 11 Virtual Journal for Biomedical Optics

Akbar Samadi and S. Nader S. Reihani, "Role of condenser iris in optical tweezer detection system," Opt. Lett. 36, 4056-4058 (2011)

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