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Proceedings Paper

Quantifying heat transfer in DMD-based optoelectronic tweezers with infrared thermography
Author(s): Peter J. Pauzauskie; Hsan-Yin Hsu; Arash Jamshidi; Justin K. Valley; Shao Ning Pei; Ming C. Wu
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Paper Abstract

Optoelectronic tweezers (OET) have emerged in recent years as a powerful form of optically-induced dielectrophoresis for addressing single cells and trapping individual nanostructures with DMD-based virtual-electrodes. In this technique an alternating electric field is used to induce a dipole within structures of interest while very low-intensity optical images are used to produce local electric field gradients that create dynamic trapping potentials. Addressing living cells, particularly for heat-sensitive cell lines, with OET's optical virtual-electrodes requires an in-depth understanding of heating profiles within OET devices. In this work we present quantitative measurements of the thermal characteristics of single-crystalline-silicon phototransistor based optoelectronic tweezers (PhOET). Midwave infrared (3 - 5 micron) thermographic imaging is used to determine relative heating in PhOET devices both with and without DMD-based optical actuation. Temperature increases of approximately 2°C from electrolyte Joule-heating are observable in the absence of DMD-illumination when glass is used as a support for PhOET devices. An additional temperature increase of no more than 0.2°C is observed when DMD-illumination is used. Furthermore, significantly reduced heating can be achieved when devices are fabricated in direct contact with a metallic heat-sink.

Paper Details

Date Published: 10 February 2010
PDF: 8 pages
Proc. SPIE 7596, Emerging Digital Micromirror Device Based Systems and Applications II, 759609 (10 February 2010); doi: 10.1117/12.846247
Show Author Affiliations
Peter J. Pauzauskie, Lawrence Livermore National Lab. (United States)
Hsan-Yin Hsu, Univ. of California, Berkeley (United States)
Arash Jamshidi, Univ. of California, Berkeley (United States)
Justin K. Valley, Univ. of California, Berkeley (United States)
Shao Ning Pei, Univ. of California, Berkeley (United States)
Ming C. Wu, Univ. of California, Berkeley (United States)

Published in SPIE Proceedings Vol. 7596:
Emerging Digital Micromirror Device Based Systems and Applications II
Michael R. Douglass; Larry J. Hornbeck, Editor(s)

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