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Proceedings Paper

Surface imaging using optically controlled microrods
Author(s): D. B. Phillips; H. Schäfer; M. Steinhart; M. J. Padgett; M. J. Miles; D. M. Carberry
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Paper Abstract

We present an imaging technique using an optically trapped silica microrod probe controlled using holographic optical tweezers. The probe is raster scanned over a surface, allowing an image to be recorded in a manner analogous to scanning probe microscopy (SPM), with closed loop feedback control provided by high-speed CMOS camera image tracking. We demonstrate a proof of principle of this technique by imaging the surface of an oil droplet. We estimate the normal force exerted on the sample during imaging to be 1 pN. The resolution is limited by the diameter of the microrod tip, thermal motion of the probe and the tracking accuracy. As our technique is not diraction limited, there is scope for signicant improvement by reducing the tip diameter, and position clamping to reduce unwanted thermal motion.

Paper Details

Date Published: 9 September 2011
PDF: 9 pages
Proc. SPIE 8097, Optical Trapping and Optical Micromanipulation VIII, 809704 (9 September 2011); doi: 10.1117/12.893796
Show Author Affiliations
D. B. Phillips, Univ. of Bristol (United Kingdom)
H. Schäfer, Univ. Osnabrück (Germany)
M. Steinhart, Univ. Osnabrück (Germany)
M. J. Padgett, Univ. of Glasgow (United Kingdom)
M. J. Miles, Univ. of Bristol (United Kingdom)
D. M. Carberry, Univ. of Bristol (United Kingdom)

Published in SPIE Proceedings Vol. 8097:
Optical Trapping and Optical Micromanipulation VIII
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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