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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 8, Iss. 5 — Jun. 6, 2013

Measuring three-dimensional interaction potentials using optical interference

Nassir Mojarad, Vahid Sandoghdar, and Madhavi Krishnan  »View Author Affiliations


Optics Express, Vol. 21, Issue 8, pp. 9377-9389 (2013)
http://dx.doi.org/10.1364/OE.21.009377


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Abstract

We describe the application of three-dimensional (3D) scattering interferometric (iSCAT) imaging to the measurement of spatial interaction potentials for nano-objects in solution. We study electrostatically trapped gold particles in a nanofluidic device and present details on axial particle localization in the presence of a strongly reflecting interface. Our results demonstrate high-speed (~kHz) particle tracking with subnanometer localization precision in the axial and average 2.5 nm in the lateral dimension. A comparison of the measured levitation heights of trapped particles with the calculated values for traps of various geometries reveals good agreement. Our work demonstrates that iSCAT imaging delivers label-free, high-speed and accurate 3D tracking of nano-objects conducive to probing weak and long-range interaction potentials in solution.

© 2013 OSA

OCIS Codes
(110.0180) Imaging systems : Microscopy
(110.1650) Imaging systems : Coherence imaging
(170.6900) Medical optics and biotechnology : Three-dimensional microscopy
(180.3170) Microscopy : Interference microscopy

ToC Category:
Imaging Systems

History
Original Manuscript: February 20, 2013
Revised Manuscript: March 28, 2013
Manuscript Accepted: March 31, 2013
Published: April 9, 2013

Virtual Issues
Vol. 8, Iss. 5 Virtual Journal for Biomedical Optics

Citation
Nassir Mojarad, Vahid Sandoghdar, and Madhavi Krishnan, "Measuring three-dimensional interaction potentials using optical interference," Opt. Express 21, 9377-9389 (2013)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=oe-21-8-9377


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