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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. 7, Iss. 2 — Feb. 1, 2012

Three-dimensional positioning of optically trapped nanoparticles

Takayuki Higuchi, Quang Duc Pham, Satoshi Hasegawa, and Yoshio Hayasaki  »View Author Affiliations


Applied Optics, Vol. 50, Issue 34, pp. H183-H188 (2011)
http://dx.doi.org/10.1364/AO.50.00H183


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Abstract

We firstly demonstrate the three-dimensional (3D) measurement of a nanometer-sized sphere held in optical tweezers in water using an in-line digital holographic microscope with a green light emitting diode. Suppressing the movement with optical tweezers enabled us to detect the three-dimensional position of a polystyrene sphere with a diameter of 200 nm. The positioning resolutions of the microscope were 3.2 nm in the transverse direction and 3.4 nm in the axial direction, from the standard deviation of measurements of the 200 nm sphere fixed on glass. Changes in the Brownian motion in response to a change in the trapping laser power were measured. We also demonstrated that this holographic measurement is an effective method for determining the threshold power of the optical trapping.

© 2011 Optical Society of America

OCIS Codes
(020.7010) Atomic and molecular physics : Laser trapping
(050.1970) Diffraction and gratings : Diffractive optics
(090.1995) Holography : Digital holography
(350.4855) Other areas of optics : Optical tweezers or optical manipulation

ToC Category:
Optical Trapping

History
Original Manuscript: August 1, 2011
Revised Manuscript: October 8, 2011
Manuscript Accepted: October 19, 2011
Published: November 28, 2011

Virtual Issues
Vol. 7, Iss. 2 Virtual Journal for Biomedical Optics
Digital Holography and 3D Imaging 2011 (2011) Applied Optics

Citation
Takayuki Higuchi, Quang Duc Pham, Satoshi Hasegawa, and Yoshio Hayasaki, "Three-dimensional positioning of optically trapped nanoparticles," Appl. Opt. 50, H183-H188 (2011)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ao-50-34-H183

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