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Proceedings Paper

Microbubble trapping in inverted optical tweezers
Author(s): Thomas J. Smart; Mehmet Burcin Unlu; Philip H. Jones
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Paper Abstract

We have developed an inverted microscope optical tweezers for trapping and manipulation of microscopic gas bubbles. Trapping is achieved by a time-averaged optical trap using a rapidly-scanning Gaussian laser beam. Unlike holographic optical tweezers for microbubbles that employ a Laguerre-Gaussian beam, in this configuration the backwards-directed optical gradient force is sufficient to confine a microbubble against both the optical scattering force and the microbubble buoyancy. We have calibrated the optical trapping forces for microbubbles with a range of sizes, and determined the scanning trap configuration that produces the strongest confinement. Our system also includes a real-time “point-and-click” user interface for interactive selection, capture and isolation of individual microbubbles with optimal trap stiffness.

Paper Details

Date Published: 25 August 2017
PDF: 6 pages
Proc. SPIE 10347, Optical Trapping and Optical Micromanipulation XIV, 1034731 (25 August 2017); doi: 10.1117/12.2274033
Show Author Affiliations
Thomas J. Smart, Univ. College London (United Kingdom)
Mehmet Burcin Unlu, Bogazici Univ. (Turkey)
Philip H. Jones, Univ. College London (United Kingdom)

Published in SPIE Proceedings Vol. 10347:
Optical Trapping and Optical Micromanipulation XIV
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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