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Optics Letters

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  • Editor: Alan E. Willner
  • Vol. 37, Iss. 11 — Jun. 1, 2012
  • pp: 2109–2111

Tuning the detection sensitivity: a model for axial backfocal plane interferometric tracking

Lars Friedrich and Alexander Rohrbach  »View Author Affiliations


Optics Letters, Vol. 37, Issue 11, pp. 2109-2111 (2012)
http://dx.doi.org/10.1364/OL.37.002109


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Abstract

Backfocal plane (BFP) interferometry is a single particle tracking technique that allows one to measure minute displacements of a microscopic particle from the center of a beam’s focus in three dimensions. In this Letter, we present a Fourier optics model to describe the interference effects that allow one to track the position of a particle moving along the optical axis. A detection numerical aperture is derived theoretically and confirmed experimentally, within which the interference intensity has a positive correlation with the axial position of the scatterer. For larger detection angles, the correlation is negative. The model helps to understand previously reported measurements and to optimize BFP interferometric tracking.

© 2012 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(140.7010) Lasers and laser optics : Laser trapping
(260.3160) Physical optics : Interference
(290.0290) Scattering : Scattering

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: January 3, 2012
Revised Manuscript: April 15, 2012
Manuscript Accepted: April 15, 2012
Published: June 1, 2012

Citation
Lars Friedrich and Alexander Rohrbach, "Tuning the detection sensitivity: a model for axial backfocal plane interferometric tracking," Opt. Lett. 37, 2109-2111 (2012)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-37-11-2109


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References

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