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Issue 11, 2007
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μ-Hotplate enhanced optical heating by infrared light for single cell treatment

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Abstract

In this study we present a simple approach for fast and localised heating that relies on the strong absorbance of infrared light by microsized patterned surfaces (“μ-hotplates”). Two different materials, μ-arrays of carbon and gold, were tested with respect to their absorbance of the 830 nm diode laser light and their applicability. Both materials were found to be suitable for inducing controlled heating to a temperature increase of more than 10 °C within less than a second. The effect of optical heating on living cells (colon cancer cell line SW 480) was investigated with a modified fluorescence microscope. The temperature was controlled by varying the intensity and the exposure time of the laser light. Depending on temperature, induced death of cells in direct contact with the absorbent material was observed, or otherwise cells were kept alive. Cells survive the direct exposure of IR light without the use of the μ-hotplates. In contrast to common heating systems, the optical heating does not need direct contact to a temperature control device. Therefore, it is a very flexible method that can easily be implemented within any microchip. We believe that it will be a versatile tool for initiation and modulation of biochemical or cellular reactions, reversible cell membrane opening, and for control of cell growth.

Graphical abstract: μ-Hotplate enhanced optical heating by infrared light for single cell treatment

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Article information


Submitted
15 May 2007
Accepted
09 Aug 2007
First published
21 Aug 2007

Lab Chip, 2007,7, 1509-1514
Article type
Paper

μ-Hotplate enhanced optical heating by infrared light for single cell treatment

H. Reinhardt, P. S. Dittrich, A. Manz and J. Franzke, Lab Chip, 2007, 7, 1509
DOI: 10.1039/B707185J

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