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Optics Letters

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  • Vol. 18, Iss. 19 — Oct. 1, 1993
  • pp: 1678–1680

Scanning-force microscope based on an optical trap

Lucien P. Ghislain and Watt W. Webb  »View Author Affiliations


Optics Letters, Vol. 18, Issue 19, pp. 1678-1680 (1993)
http://dx.doi.org/10.1364/OL.18.001678


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Abstract

An optically trapped prolate glass stylus is the force-sensing element of a novel scanning-force microscope. Stylus displacement is detected with the use of the forward scatter of the trapping laser beam. Radiation forces owing to the three-dimensional intensity distribution near the focus permit the stylus to be both positioned with fine control and oriented along the z (optic) axis. Details of 20-nm size appear in traces recorded with a crude stylus in a trap formed with 1064-nm radiation. The spring constant of the optical-force transducer is below 10−4 N/m, which is to be compared with ∼0.1 N/m for typical mechanical cantilevers used in atomic-force microscopy. This gentler technique should improve the sensitivity of scanning-force microscopy for the imaging of soft samples in aqueous media.

© 1993 Optical Society of America

History
Original Manuscript: May 7, 1993
Published: October 1, 1993

Citation
Lucien P. Ghislain and Watt W. Webb, "Scanning-force microscope based on an optical trap," Opt. Lett. 18, 1678-1680 (1993)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-18-19-1678


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