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Proceedings Paper

Optical stretching on chip with acoustophoretic prefocusing
Author(s): M. Khoury; R. Barnkob; L. Laub Busk; P. Tidemand-Lichtenberg; H. Bruus; K. Berg-Sørensen
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Paper Abstract

We demonstrate the use of a two-beam optical trap (an optical stretcher) in a low-cost microfluidic system with the purpose of measuring the mechanical properties of cells and vesicles. Delivery of micrometer-sized particles and cells to the optical stretcher is obtained by acoustophoretic prefocusing. This focusing mechanism aims for target particles to always flow in the correct height relative to the optical stretcher, and is induced by a piezo-electric ultrasound transducer attached underneath the chip and driven at a frequency leading to a vertical standing ultrasound wave in the microchannel. Trapping and manipulation is demonstrated for dielectric beads. In addition, we show trapping, manipulation and stretching of red blood cells and vesicles, whereby we extract the elastic properties of these objects. Our design points towards the construction of a low-cost, high-throughput lab-on-a-chip device for measurement of mechanical properties of cells and vesicles.

Paper Details

Date Published: 10 October 2012
PDF: 11 pages
Proc. SPIE 8458, Optical Trapping and Optical Micromanipulation IX, 84581E (10 October 2012); doi: 10.1117/12.945923
Show Author Affiliations
M. Khoury, Technical Univ. of Denmark (Denmark)
R. Barnkob, Technical Univ. of Denmark (Denmark)
L. Laub Busk, Technical Univ. of Denmark (Denmark)
P. Tidemand-Lichtenberg, Technical Univ. of Denmark (Denmark)
H. Bruus, Technical Univ. of Denmark (Denmark)
K. Berg-Sørensen, Technical Univ. of Denmark (Denmark)


Published in SPIE Proceedings Vol. 8458:
Optical Trapping and Optical Micromanipulation IX
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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